Explosive Blast: Available at level 26, this move is a Power Bolt that hits a group. A ball of energy flies out, and where it impacts, it explodes out in a wave of knockback, about a 50% DFO Gold chance of sending the bad guy flying.
From reports, the direction of knockback is away from the Blaster, not from the center of the blast. Again, not a power that is very useful to a Blapper, but hey, if you want it, it's yours.
Nova: Available at level 32, this is your "Nuke" power. Your "Holy crap, this is going bad, GET AWAY" power. In laymen’s terms, you explode in a ball of energy energyness. Nearly everyone around you goes flying away from the knockback. The damage to each bad guy -does- vary.
From a BI of 8 to some, 12 to most, and 16 to the rest, remember what I said about the best part of being a Blapper was drawing agro from only one person at a time? This power goes against the rule, but dammit, it's just too much fun.
When this goes off, it takes about 10 endurance to activate. Then, no mater how much endurance you have left, it takes ALL of it. Leaving you with none, Yeah, none. And you can't recover endurance for short time.