The Shadow
Hero
What about ghouls should they have a condition like paralysis again?
In a word, yes.
Now, here's a first stab at Energy Drain - 5e style!
When a creature with Energy Drain hits, it does the indicated damage, and in addition the victim loses one Hit Die. (Or more, depending on the creature.) The victim's largest hit dice are lost first.
Roll the drained Hit Di(c)e. The victim loses that many hit points, and the draining creature heals by half that amount. The victim takes disadvantage on attacks and checks in the next round.
If a character is Energy Drained past the number of hit dice that it has, it immediately falls unconscious. A further Energy Drain will kill the character (and possibly enable the attacker to spawn him or her as an undead creature, according to the attacker's description).
Any character that has lost hit dice from or been rendered unconscious by Energy Drain receives the Drained condition. Drained characters need to make a Con save vs. DC 10 (?) to regain hit dice, and receive only half the usual amount for the campaign. The Drained condition goes away when all hit dice are recovered.
How's that? Should Drained characters perhaps also receive disadvantage on certain checks and/or saves, to mimic the loss of competence from lost levels?
EDIT: Oh, and presumably the Restoration spell can remove the Drained condition, as well as restoring lost hit dice.
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