toucanbuzz
No rule is inviolate
Level drain was a fun AD&D threat IF you could avoid it. When it actually hit, less fun and hurt feelings unless your DM generously stocked treasure hoards with greater restoration spells and house-ruled the XP loss didn't apply.
Personally, I lean to removing the save for drain effects to give 5E drain that AD&D deadly feel.
Personally, I lean to removing the save for drain effects to give 5E drain that AD&D deadly feel.