The VOIDRUNNER'S CODEX is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
I particularly like @dvd4vr 's solution, though I would likely combine it with @jgsugden 's rule that one of the spells must target "you and only you", and probably a combined spell cap too. Fully writing this version out now so I can gauge and simplify.
I did, however, think there might be a...