Eh, can be done without Draconium.
Reinforced Obsidian resists wither explosion, so does anything hit with the wand cap from Thaumcraft that needs a wither star to craft. From there, just use bellthornes for AE damage. Even better, kill lots of withers at once with bellthornes for even faster rate of return. Create with Autonomous Activators on platform that extends into summoning room via Funky Locomotion.