The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
As an analogy, this is a bit like designing a True Fighter which crits on every attack, and in exchange gives up the ability to wear leather armor or use a trident.
I think one basic balance fix could involve spellcasting progression slower than the Sorcerer (getting 3rd level spells at 7th) and not getting access to 9th level spells.