You add an incredibly powerful additive to a held bomb to create a mega bomb, greatly increasing its area and power.
You use an Interact action to throw the mega bomb, rather than Strike, and you don’t make an attack roll. The mega bomb affects creatures in a 30-foot-radius burst, centered within 60 feet of you. The bomb deals damage as if each creature were the primary target, with a basic Reflex save.
On a failed save, a creature also takes any extra effects that affect a primary target (such as flat-footed from bottled Lightning). While all targets in the area take splash damage as primary targets, there is no further splash beyond that area. If your next action after creating a mega bomb isn’t an Interact action to throw it, the mega bomb denatures and loses all effects.
You can cast your spells effortlessly by tapping into the leylines of the world. If your next action is to _Cast a Spell_of 5th level or lower that has no duration, you don’t expend the prepared spell as you cast it.
Your inborn magical nature lets you redirect ambient energies
to fuel your spells. If your next action is to Cast a Spell of
5th level or lower that has no duration, you don’t expend the
spell’s slot when you cast it.