Seems like it could get boring very quickly. 
I might try this, but there are other ways to get XP fast which don't seem as much of a drone.
@Ninth Cloud
Justice
You forgot to mention that the bomb groups spawn at night, not during the day. With the halloween event still going on the spawns may be happening all the time. (haven't checked this out during the halloween event yet) During non events though you have to do this during night cycles. The bombs will start appearing just after sunset and continue untill just after sunrise. Also this technique will work from 20-mid 20's after which time you will outlevel these mobs, so it's really a small window of opportunity.
It is a fun way to level though if you like soloing and you're tired of doing the same routine.
This trick can actually be done as soon as u can fly, have a Ranged AoE attack and are approximately lvl 13. The bombing of the Red River Gorge by the trolls in the Hollows is my initial area for this tactic. However, I only use this for my toons that have nearly no ability to solo (ice/storm troller). I got the sky raider jet pack from the Atlas Bank mish and just hit the bomb with my frostbite (AoE damage/immobilize). I would suggest trying to start as soon as possible if you are like me and don't really care for the 13-20 lvls where as a controller you lack most of the good powers and the enhancements for them.
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This trick can actually be done as soon as u can fly, have a Ranged AoE attack and are approximately lvl 13. The bombing of the Red River Gorge by the trolls in the Hollows is my initial area for this tactic. However, I only use this for my toons that have nearly no ability to solo (ice/storm troller). I got the sky raider jet pack from the Atlas Bank mish and just hit the bomb with my frostbite (AoE damage/immobilize). I would suggest trying to start as soon as possible if you are like me and don't really care for the 13-20 lvls where as a controller you lack most of the good powers and the enhancements for them.
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Yes, i failed to mention the red river area in the hollows. This is doable starting at about lvl 12 or so and good till around lvl 16. (still doable after that but the time spent versus reward earned drops significantly due to outleveling the mobs)
The crucial thing to understand is that AOE must be used, not single target attacks, otherwise the bomb will explode but you will not get xp for the mob it kills.
Ive done these quite often with my khelds. It's kind of a fun break from the norm.
Hi guys!
This guide, I should preface, is usable by anyone with a fairly strong ranged attack (Nemesis Staff, for example) and any old ranged AoE, of any strength (from Freezing Rain to Fireball). Fireball like moves alone should suffice.
This guide talks about a fairly simple & easy leveling tactic that can be done as soon as you hit 20 in Striga Isle. I believe the tactic might work elsewhere (anywhere mobs are clustered around bombs, say Red River in the Hollows) but this is where I discovered it.
Upon entering Striga Isle, head north to a couple of huge boats with mobs all over them. You should see in this area groups of mobs, usually including 1-2 bosses, clustered around a bomb and an explosive.
First, you tag all the mobs by using the AoE. Then, hopefully before they kill you, you destroy the bomb. Note: MAKE SURE NOT TO TARGET THE EXPLOSIVE. Bombs have far fewer hitpoints than even a minion, while explosives are significantly harder to kill. What should happen is the bomb goes off...setting off the explosive...and killing all the mobs. Since you've tagged them all, you are now the proud owner of 4-600 XP or so. Quite a bit if you do this immediately at 20.
Well...that's about it. Be careful around Consiglieres, they have holds. And be ready to run like hell if you miss the bomb. But even with debt, this is a FAST way to level, at least for a little.