Junk Bomb (T3, W3)

Level12

You energize a small pile of junk (such as material to create a handy junkbot) or junk device created by one of your technomancer spells (such as handy junkbot or junksword). If you target a junk object you’re holding, you can throw it as part of the standard action to cast this spell, with a range increment of 10 feet. The junk explodes, destroying the junk (or junk device) and dealing @[6d6 slashing damage][roll 6d6 as damage for 'Junk Bomb'] to all creatures in a 10-foot‐radius burst. If you targeted a junk device created by one of your technomancer spells, increase the damage dealt by each of this spell’s damage dice by an amount equal to that spell’s level (such as 6d6+18 slashing damage if you targeted a handy junkbot created by a 3rd-level spell).

You can use this spell against a junk device created by another creature, though the device’s creator can negate the spell entirely with a successful Will save.