Illithidbix
Explorer
I would be somewhat concerned about my players enjoyment with added death spirals. My experience is they sound great on paper, but become kinda tiresome in play.
But if you do want to do it, I think Jester David's suggestion of "gain one level of Exhaustion when you hit 0 hit points" is the most elegant.
Also means that if you choose to knock a target out when you drop them to zero HP, this still has unpleasant side effects.
On a minor note you might want to allow the Path of the Beserker barbarian to ignore extra exhaustion gain if they drop to 0 hitpoints whilst under a frenzy, because they already gain a level of exhaustion when their rage ends, and being knocked unconscious ends.
Note, Exhaustion is very hard to remove, a long rest only removes one level of it, likewise Greater Restoration (5th Level Bard/Cleric Druid) which has the material component: "diamond dust worth at least 100 gp, which the spell consumes" only removes a single level of exhaustion.
There is also the (very rare) Potion of Vitality.
When you drink this potion, it removes any exhaustion you are suffering and cures any disease or poison affecting you. For the next 24 hours, you regain the maximum number of hit points for any Hit Die you spend. The potion's crimson liquid regularly pulses with dull light, calling to mind a heartbeat.
Which might be exactly as harsh as you want it to be.
But if you do want to do it, I think Jester David's suggestion of "gain one level of Exhaustion when you hit 0 hit points" is the most elegant.
Also means that if you choose to knock a target out when you drop them to zero HP, this still has unpleasant side effects.
On a minor note you might want to allow the Path of the Beserker barbarian to ignore extra exhaustion gain if they drop to 0 hitpoints whilst under a frenzy, because they already gain a level of exhaustion when their rage ends, and being knocked unconscious ends.
Note, Exhaustion is very hard to remove, a long rest only removes one level of it, likewise Greater Restoration (5th Level Bard/Cleric Druid) which has the material component: "diamond dust worth at least 100 gp, which the spell consumes" only removes a single level of exhaustion.
There is also the (very rare) Potion of Vitality.
When you drink this potion, it removes any exhaustion you are suffering and cures any disease or poison affecting you. For the next 24 hours, you regain the maximum number of hit points for any Hit Die you spend. The potion's crimson liquid regularly pulses with dull light, calling to mind a heartbeat.
Which might be exactly as harsh as you want it to be.
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