It's not that DoT's are worthless against those foes. It's that there is usually a better dps chain you can use to take them down that also uses endurance more efficiently.
Rains also tend to cause enemies to flee, and that's usually the last thing you want when you're working on a hard target.
If you don't care about the enemy running or have it locked down somehow and you don't have a better dps chain to use or have a gap... and if you have the end to spare... The rains work just fine. You can even think of the DoT as a -regen if you want.
Some people with immobs still use burn like this pretty effectively, and ignite from AR was recently adjusted because it was too potent. I think the rains cost a little too much to use against single targets though.
That just seems silly to me.
Throwing a DoT on a tough foe is a lot better than just doing nothing.
Hmm. Take the foes regeneration rate as "R" at (% of total HP over time) and the DoT's damage over time as "D" at (% of the foe's total HP over the same amount of time).
Does D>R?
And you are likely to be using other attacks as well.
I was looking at rains like rain of fire, ice storm, blizzard, caltrops; most of which have a -spd component... maxed for damage and combined with aoe -res producers such as tar pit and acid mortar...
looks good on paper.
Do BU powers actually affect the dmg output of these type of DoTs?
How do procs fire off on these? [nvm; found the Mini-Guide]
Apparently, I play "City of Shakespeare"
*Arc #95278-Gathering the Four Winds -3 step arc; challenging - 5 Ratings/3 Stars (still working out the kinks)
*Arc #177826-Lights, Camera, Scream! - 3 step arc, camp horror; try out in 1st person POV - 35 Ratings/4 Stars
My favorite toon is a fire blaster. I don't see a problem with DoTs. I know him well enough to be able to turn my attention to another foe so the DoT is wearing off. The only "problem" is that many players get into the mindset of "hit it until it's dead" and keep blasting regardless of the fact that the DoT will finish the job. An enemy might get one additional hit in on you, but that shouldn't be a problem.
As for rains..... they do a lot of damage to a lot of people and are very endurance-friendly when you use them on several enemies. Rain of Fire, even with enemies moving out of it, will take a serious chunk out of an entire spawn's health. There's a minor slow mechanism applied to at least several of the rains so that mobs don't leave them too quickly.
Arc ID#30821, A Clean Break
The only problem with defeating the Tsoo is that an hour later, you want to defeat them again!
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All buffs (and debuffs) on the caster at the time of casting are transferred to the attack.
If you ever notice a tar patch with a glowing green ghost in the center? Caster had AM on them when casting it 
Note, they are transferred entirely, including remaining duration.
Orc&Pie No.53230 There is an orc, and somehow, he got a pie. And you are hungry.
www.repeat-offenders.net
Negaduck: I see you found the crumb. I knew you'd never notice the huge flag.
[ QUOTE ]
All buffs (and debuffs) on the caster at the time of casting are transferred to the attack.
[/ QUOTE ]
Even a lot of invisible pseudo-pets are set to inherit buffs. If you use Howling Twilight on a big group while Hasten is up, you get a really loud "HAAAAASTEEEENNNNN!!!" sound effect.
Fulcrum Shift summons a lot of pets too and is prone to this.
[ QUOTE ]
All buffs (and debuffs) on the caster at the time of casting are transferred to the attack.
[/ QUOTE ]Well, that's true for most but not all pseudopet summons.
http://www.fimfiction.net/story/36641/My-Little-Exalt
[ QUOTE ]
[ QUOTE ]
All buffs (and debuffs) on the caster at the time of casting are transferred to the attack.
[/ QUOTE ]Well, that's true for most but not all pseudopet summons.
[/ QUOTE ]
True, but those are the few exceptions to the rule.
Orc&Pie No.53230 There is an orc, and somehow, he got a pie. And you are hungry.
www.repeat-offenders.net
Negaduck: I see you found the crumb. I knew you'd never notice the huge flag.
[ QUOTE ]
My favorite toon is a fire blaster. I don't see a problem with DoTs. I know him well enough to be able to turn my attention to another foe so the DoT is wearing off. The only "problem" is that many players get into the mindset of "hit it until it's dead" and keep blasting regardless of the fact that the DoT will finish the job. An enemy might get one additional hit in on you, but that shouldn't be a problem.
[/ QUOTE ]
And DoTs can be used to your advantage, especially if you're solo and can control what gets hit. When fighting Nemesis, I got very adept at timing DoT attacks so that both Lts drop dead at exactly the same time. Nobody gets vengeance up around my fire blaster.
DoT's sometimes get shrugged off as solid damage hitters against some Lts, Bosses and EBs (except, maybe, for the 15sec 'rains'); is this because of their regeneration rates?
How much would their regen have to be debuffed to allow DoT powers, like the rains, to have more than a trivial effect against these foes?
Apparently, I play "City of Shakespeare"
*Arc #95278-Gathering the Four Winds -3 step arc; challenging - 5 Ratings/3 Stars (still working out the kinks)
*Arc #177826-Lights, Camera, Scream! - 3 step arc, camp horror; try out in 1st person POV - 35 Ratings/4 Stars