Tempory HP stack?

Voldrath

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I'm going to be running a game saturday that will see frequent use of the aid spell from celestial allys. My question is if the tempory hp from multiple castings stack; the PHB didn't say.
 
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I see no reason why they should not stack. A wizard who casts multiple vampiric touch spells will gain more temporary hit points. The morale bonuses do not stack, of course.
 

I kind of expected that they would, but I'd like to have a reference. Where did you find your conclusion? The Vampiric Touch Description didn't say. Also, this is a multiple DM world so i need to go by the letter.
 
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Why do we need a reference? There is nothing to prohibit this. Nothing in the spell prohibits it. For each spell, you get a +1 morale bonus to attack rolls and fear saves, and 1d8 temporary hit points. The rules for like bonuses rules out the morale bonuses stacking, but there is no rule that says that they do not stack, so they must. If they had to write a rule for all "negatives," the PH would be 5 inches thick.

IOW, the PH does not have to say that they stack in order for them to stack. The rules for stacking do not prohibit them from stacking, and no text says they do not, especially in the spell, so they must stack. If they did not, the spell would say so.

Your DMs should know this.
 

PHB p153
"Stacking Effects: Spells that give bonuses or penalites to attack rolls, damage rolls, saving throws, and other attributes usually do not stack with themselves. For example, two bless spells don't give recipients twice the benefits of one bless.... more generally, two bonuses of the same type don't stack even if they come from different spells...In cases when two or more identical spells are operating in the same area, but at different strengths only the best one applies."

So in other words, they don't stack. There is one aid up at a given time. Each time an aid's temp hps are knocked out, it can be replaced with another aid (and more temp hps from that casting), but the total temp hps can never exceed the temp hps from a single casting.

Its the same as casting say haste. You can't cast multiple hastes to get +20 AC bonus and 5 extra actions. As a rule spells NEVER stack with themselves. Vampiric touch would only grant more temp hps if you did more damage than you currently had temp hps, though it could heal you multiple times if you were wounded (the instantaneous duration of the spell).

If a spell is in effect you cannot get more benefit from another casting, unless you roll higher (in the case of spells with variables) or the effect is instantaneous (as with healing spells).

Spells never stack with themselves, unless otherwise stated in the spell description.
 

Yep, temporary is officially a named bonus type and only the highest bonus applies. This ruling was made after the psionics handbook came out and people started using power triggered vigors to gain infinite hps.
 

Voldrath said:
I'm going to be running a game saturday that will see frequent use of the aid spell from celestial allys. My question is if the tempory hp from multiple castings stack; the PHB didn't say.

Depends on how you look at it. Generally, spell effects don't stack, as Gromm already pointed out. However, in the case of a Vampire's Energy Drain ability, the temporary hit points it gains do indeed stack and last for 1 full day. So, this isn't a hard and fast rule that applies to everything, but as far as I know, it always applies to spells.
 

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