StrykerX

I doubt it would be possible without code changes. The game engine would have no way of knowing whether the attack would kill the target or not until actually applying the damage, and KB is generally applied at the same time as the damage so by the time it could test for the mob being dead (assuming "enemy is dead" is even a valid flag to base an effect on) the KB would already be applied. It might be possible to fake it with a delayed KB that applied a couple of server ticks after the hit lands to give the damage time to resolve first, but that would look rather odd and still might not be possible since once the enemy is a corpse it may not be targetable by KB. Best case: you'd either have a power that applied its damage before the hit reaction so the KB could play at the same time as the hit FX, or you'd get a "he got hit and then a quarter of a second later he went flying" effect that looked like a bad stunt man messing up his timing. Most likely case: it isn't technically possible at all.

You should be fine using pretty much any AoE on a /Dark Corruptor, just be sure to remember that Fearsome Stare is an AoE to-hit debuff that happens to scare things and slot it accordingly. With Fearsome Stare and Darkest Night both ED capped on to-hit debuff you'll pretty much be softcapped to most enemies with only a little effort, and once you get Fluffy too it just gets better. HoB + Tar Patch should be a very fun combination and Tar Patch in general will help make up for no Aim... it's just too bad that HoB is mechanically an odd form of DoT rather than a "rain" type power so it can't start Scourging midway like Rain of Fire or Ice Storm can.

Actually, /Mental works fairly well from cone range if you skip Psychic Shockwave and just use Psychic Scream and occasionally move in for a quick Drain Psyche. /Mental has the only cone in a secondary so it's worth taking just for that if you are already cone heavy, kind of like taking /Energy just for Boost Range if you want a long range build.

Try a Huntsman build SoA. You basically take all of the basic gun attacks from the default Soldier set and then add in Cloak and Bane Spider Armor from the Bane tree. You can also grab Call Reinforcements if you want pets or Surveilance, and if you don't mind pulling out a mace for a second Build Up is nice. You'll have a much tougher character than an AR/Devices Blaster at the cost of a bit of damage, and you'll add a lot of team utility thanks to the SoA leadership skills.

I don't have a lot of experience with DP so this is mostly based on theory, but I would certainly take Empty clips. No build will ever let you have Hail of Bullets up every spawn (at least not unless you take 40+ seconds a spawn) so you will want decent AoE on the spawns where HoB is down. Empty Clips is actually a bit stronger than most Blaster cones (aside from Fire Breath), especially with Incendiary ammo... about the only way I'd ever consider skipping it would be on a DP/Fire that's optimized for PBAoE.

I'd probably skip either Executioner's Shot or Piercing Rounds. Piercing has nice range but too long a recharge to fit into a standard attack chain, and Executioner's has a decent recharge but short range. Taking both would use a lot of slots for minimal benefit, especially since I believe the Piercing Rounds -resist debuff is only applies while using Standard ammo and you'll probably be using Incendiary 90% of the time. I'd be most likely to skip Piercing so I could get a seamless ST attack chain, but I can also see skipping Executioner's and using an AoE or your ST immobilize as filler for your ST chain if you prefer staying further back.

Oh, /Traps works very well too. You have to be a Corruptor, but since DP is better on Corruptors than Blasters anyway that's not a problem...

(Sorry, couldn't resist)

I usually recommend Tough as a 3% defense mule and Weave actually used... Tough on a Blaster isn't worth the endurance (though if you can run it with no endurance issues you might as well).

Technically, I believe Bosses need mag 4 to hold and EBs need mag 6, but since almost all holds are mag 3 it won't make a practical difference to a Blaster. But I don't think the mag 4 "critical" holds Controllers sometimes get will hold an EB. Also, EB versions of AVs / Heroes still get the purple triangles so those are just as hard to hold as a true AV is. In fact I believe they are marginally harder since I think AVs do have only Boss level protection while the triangles are down while EB versions have a couple extra points.

I like the idea of an undercover arc, but it doesn't really make sense from a lore perspective to just allow patron powers to all heroes since they are specifically tied to villains who would not want any heroes learning their secrets.

/Energy would work if you don't mind the oddity of a "long range" pistol set, though to be fair considering how short the weapon ranges are in CoX I could see not caring.

/Fire or /Mental would be good for PBAoE use, though redraw will be a bit of an issue. I'd actually prefer /Mental to /Fire since it adds some mitigation and a cone... with DP I'd rather spend most of my time a couple dozen feet in front of a spawn shooting in and then occasionally duck in to fire off HoB or a PBAoE.

/Devices is probably the absolute worst fit. It matches well conceptually, but no Aim or Build Up? Blech!

/Ice might also be a pretty solid choice since it gives decent mitigation to help with using HoB (and for not dying in general). DP/Ice might even have a reason to use Cryo ammunition for stacked slows, though considering how puny the slow is on Blaster Cryo I doubt it.

High Ranged defense plus Acrobatics will provide pretty good mez protection. Most mezzes that can be used at range are flagged as Ranged attacks, and the ones that are not (usually flagged as only Psionic) are usually holds, and Acrobatics blocks a single hold. The enemy has to basically get lucky twice in a row with Ranged holds (doesn't happen often) or hit you with two non-Ranged holds (and usually only one or two enemies per group has those) to actually hold you so as long as you pop Break Frees in the rare cases where you are fighting enemies with AoE mez like stun grenades (I say "rare" because when soloing a Blaster I avoid those factions like the plague) and don't let stunners get in melee you should be good. By all means keep a column of Break Frees in your inspiration tray, but you shouldn't need them continually even against most mezzers. Of course eventually you can get mez protection from the Destiny Incarnate slot, but that's not very helpful at levels 1-49.

Go for around 33% Ranged defense (one Luck from the softcap), Acrobatics, Aid Self (mainly for downtime reduction) and maybe some AoE defense and +HP if you can fit it in and you should have a decent leveling build. Upgrade to softcapped Ranged defense once you have enough slots (probably won't happen until the 40s) and you'll be fairly survivable. The nice thing about a high damage combo like Fire/Mental is that while you can't eliminate the alpha strike you can eliminate a lot of the enemies before they get to shoot again. Just accept that you will be keeping the difficulty turned down fairly low while soloing until you get some IOs and you'll be fine... at least you will once you break that Scrapper / Brute mindset and remember to stop and heal up after each fight because you really do need the whole green bar a lot of times. (That's why almost all of my Blasters have Aid Self.)

You won't be having inf issues for long if you are doing Incarnate trials. It shouldn't take too many of those to fully IO out your character (as long as you don't feel you have to have purples or PvP IOs) so I'd go Musculature. Blasters rarely have real endurance troubles unless they don't slot their attacks for end reduction or they run a ton of toggles... since you aren't running Leadership toggles or Tough and Weave I can't imagine you still having trouble once you are well slotted. You might also look into slotting either a -KB IO or four Kinetic Crash (I like using the whole set in Power Thrust for the -KB and recharge) to deal with most KB and not running Acrobatics unless you are up against holds or high mag KB... that would pretty much solve your endurance issues even on SOs.

You can run two or three sets of Kinetic Crash on an Energy/Energy without too much trouble... it's a cheap way to get recharge and KB protection. I wouldn't put it in a major attack since it only has around 69% damage enhancement, but Power Thrust and Power Push are both perfect places for it. For that matter, with Musculature you can still get 112% damage slotting from a level 50 Kinetic Crash set and ED capping only pushes that up to 130% or so... so you may want to slot Kinetic Crash in Energy Torrent and Explosive Blast too for more recharge than Positron's and a much lower price. Four Kinetic Crash sets would pretty much mean you never had to worry about KB aside from the handful of stupidly high mag attacks that knock back everyone who isn't immune to it as well as giving you 30% recharge, and you can drop cheap Thunderstrike sets in your single target blasts for ranged defense and accuracy.

You're right, PFF can slot LotGs. Even better...

I'm not sure SSA 2 or 3 are very quick or even soloable for some characters, but if you have one who can either stand up to EBs well or else kill them before running out of inspirations (ie, Blasters) they're pretty good.

Honestly, I believe the main reason you had trouble was that you were trying to play a pure ranged Blaster without allowing yourself to use the sets that are actually best for a pure ranged Blaster. Archery is, bar none, the best option for an all ranged Blaster (and Assault Rifle is one of the next best). You get the single best ranged AoE attack in the game (Rain of Arrows), a complete single target chain with an 80 foot base range, and a longer than normal cone attack to go with your standard targeted AoE shot. You even get a decent ranged stun for Sappers or mezzing Lts. Add in /Energy for Boost Range and Hover and you simply don't have to get close to things at all. The key is getting plenty of Ranged defense and some decent recharge... which brings up the number one rule of soloing as a Blaster:

Solo Blasters that actually fight large spawns require high end IO builds.

There's no such thing as a decent cheap solo Blaster if you are used to Scrappers and Brutes. Mowing down +1/x6 or so spawns at the speed of an average Scrapper is possible, but will require either softcapped defense or high recharge and a crashless nuke (and some defense). Taking on +2/x8 mobs at Brute speed requires even more investment and probably picking high end power sets (Fire/Mental, for instance). If you just want to solo tough spawns a Blaster is a bad choice, not because they can't do it but because they take more skill, inf, and build planning to do it. Where Blasters become a good solo choice is if you have near-unlimited inf to spend, are willing to face a much steeper learning curve, and are just tired of how slow your purpled out SS/Fire/Soul Brute is and want to see what real destruction looks like. (Granted the Brute can survive better, but nothing kills as fast as a high end Blaster.)

Note: I'm not saying a high end build is required to solo on a Blaster. I'm saying it's required to solo on a Blaster at the level that a Scarapper / Brute player is used to. Blasters have soloed the ITF, but you can bet that many billions of inf and a great deal of painful learning was involved.

Before resorting to a ranged build on a melee AT I'd suggest giving some of these a try though, even if you do write off Blasters:

Plant/Fire or Plant/Psi Dominator - Seeds of Confusion is probably the best every-spawn AoE control power in the game, and perma-Domination gives you mez protection if you want to spend that much.

Fire/Traps Corruptor - good ranged AoE plus defense, mez protection, and debuffs.

Rad/Sonic Defender - not as fast as a Blaster but one of the few builds that regularly solos giant monsters without Incarnate powers. Build for ranged defense, debuff the enemy into mush, and yell at them until they fall down.

Huntsman build SoA - no spider legs, just a badass guy with a gun that can dodge almost anything and call in pets.

Archery/Energy/Munitions hover Blaster - build for enough recharge to fire off Rain of Arrows every spawn and enough ranged defense to get within one Luck of the softcap (if you are soloing large groups you should get enough inspirations to maintain one Luck and if needed one Break Free at all times). Ignore the melee attacks in Energy, it's just there for Build Up and Boost Range. Sit back at 100+ feet wiping out 90% of the minions in every spawn before they can fire a shot, then shooting the surviving mobs with lots of pointy sticks, flaming pointy sticks, and exploding pointy sticks. Go Munitions so you can occasionally pull out a missile launcher and toast a group so far away you can barely see them.

Most Tankers are relatively low damage pre-Incarnate, even if slotted for damage output. They can solo (and certainly tend to die less than most ATs) but no slotting will make them do it anywhere near as fast as a Brute or Scrapper with the same budget. The main benefit Tankers have for soloing is that you can make them tough enough to handle large spawns much more cheaply than Scrappers or Brutes and it's cheaper to make the offense-oriented sets like Fiery Aura or Shield survivable. But the only tanks that will even come close to doing Scrapper level damage are things like Fire/Fire, which also has Scrapper level survivability. My Fire/Fire Tank plays a lot like a mid-range Scrapper in terms of damage and toughness... he's tougher than a /Fire Scrapper but not really tougher than a /Willpower or /Invulnerability and does damage similar to a Scrapper with a non-damaging armor set. But most Tanks do a lot less damage and are a lot tougher.

I would assume you would still get the crash from the first Unstoppable since it is technically a set of effects that trigger when you click the power but have a 180 second delay rather than something actually triggered by the power wearing off. Using Burnout to hit Unstoppable again right before the crash should leave you at 10% health and no endurance but with Unstoppable's resists and recovery boost active. If you slot Unstoppable to cap your resists with no toggles going it should make the crash much more survivable, especially on a tank (10% health + 90% resists is still reasonably sturdy).