If the zombie was hostile to you. No creating one and instantly killing it. Cha bonus + Warlock level = a max of 25 without magical CHA boost.
Note, several subclasses straight out give you a permanent +1 hp per subclass (Draconic Sorcerer for one). You are getting your Cha bonus on top of that, but getting temp hp instead of real ones. Fair trade.
The real benefit is not the duration but that it happens whenever your kill someone. Getting those free temp hitpoints in the middle of a battle, when you've already lost 1/2 you HP is a huge benefit.
According to the rules on temporary hit points (here), "Unless a feature that grants you temporary hit points has a duration, they last until they're depleted or you finish a long rest."
How long do the temporary HP provided by Dark One's Blessing last? There's no duration listed.
Find your own truth, choose your enemies carefully, and never deal with a dragon.
"Canon" is what's factual to D&D lore. "Cannon" is what you're going to be shot with if you keep getting the word wrong.
Until you lose them by taking damage or lose them by getting new Temp hit-points, or lose them because the DM said you pissed off the Dark One.
So I could torch a zombie and they're theoretically still in effect a week later if I never take damage?
Find your own truth, choose your enemies carefully, and never deal with a dragon.
"Canon" is what's factual to D&D lore. "Cannon" is what you're going to be shot with if you keep getting the word wrong.
If the zombie was hostile to you. No creating one and instantly killing it. Cha bonus + Warlock level = a max of 25 without magical CHA boost.
Note, several subclasses straight out give you a permanent +1 hp per subclass (Draconic Sorcerer for one). You are getting your Cha bonus on top of that, but getting temp hp instead of real ones. Fair trade.
The real benefit is not the duration but that it happens whenever your kill someone. Getting those free temp hitpoints in the middle of a battle, when you've already lost 1/2 you HP is a huge benefit.
It's a very good ability, but not over powered.
According to the rules on temporary hit points (here), "Unless a feature that grants you temporary hit points has a duration, they last until they're depleted or you finish a long rest."
So you can't keep them around for a week, sadly.
only take short rests, multiple every day
Then you'll stack up exhaustion until you die, either from the debuffs or just sleep deprivation.
Until you lose them or talk a short/long rest