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Title says it all, what is the greatest amount of temporary hit points a character can have at one time? I think it's 45 from using Armor of Agathys with a 9th level spell slot, but is more possible?

Anything in RAW is acceptable except the following:

  • Weird wishes
  • Epic boons

Answers should only consider temporary hit points, not hit point mitigation methods such as polymorph, warding bond, arcane ward, etc. An ideal answer would provide the maximum one can attain by a single character's effort and the maximum attainable with the aid of others (if it's higher).

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1030

Blackrazor (DMG, p. 216) will give you temp hp = to the max of any creature you kill. So in theory as high as you can find.

The Tarrasque (MM, p. 286) has the most potential hit points of any creature published so far, at 33d20+3301.

In any case, the Tarrasque of 5th edition has a maximum natural hit point score of 990. In addition one can apply the 2nd level abjuration spell aid using a 9th level slot to further increase the maximum hit points of the Tarrasque by 40. This makes the absolute maximum for the Tarrasque's hit points (and thus the maximum temporary hit points you could gain at once via Blackrazor) 1030. Of course, you could gain more if a more powerful creature or hit-point boosting ability were to be included in the game, but this is the most in published material.


  1. Unlike in all previous editions, it is totally possible to murderize the Tarrasque with Blackrazor, the Tarrasque of 5th edition lacking the signature immortality-through-regeneration-unless-killed-via-wish of previous incarnations. It also no longer gives you 1d4 +5 magic shields for killing it, so that might be part of it.
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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – mxyzplk Dec 26 '17 at 3:55
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Up to 240 temp HP

From Xanathar's spell Mass Polymorph (page 161)

Each target gains a number of temporary hit points equal to the hit points of its new form.

The Giant Ape has 15d12+60 HP, which could generate up to 240 HP depending on how you roll the hit die.

No aid from others, you can't Stack Temp HP

Others can't help, and you can't combine sources of temp HP (from the PHB, 198)

If you have temporary hit points and receive more of them, you decide whether to keep the ones you have or to gain the new ones.

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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – mxyzplk Dec 26 '17 at 3:55
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Maximum temporary hit points is 1760

TheFiddlerWins' answer missed some things even at the time it was released. Again we use Blackrazor's Devour Soul feature (DMG 216) but we will also use the Potion of Giant Size magic item from Storm King's Thunder (236).

Devour Soul.

[...]

When it devours a soul, Blackrazor grants you temporary hit points equal to the slain's creature's hit point maximum.

-

Potion of Giant Size

[...]

For [24 hours if you are Medium or smaller], ... your hit point maximum is doubled

Since Potion of Giant Size can only affect Medium or smaller creatures we use a creature who is not the Tarrasque (who is larger than Medium... much larger...)

  • Ancient Gold Dragon

    • Base hit points equal to 28d20 + 252. [Max: 812]
  • Manual of Bodily Health

    • Increase Constitution to 30 (+10) for +1 hit point per Hit Die or +28. [Max: 840]
  • Level 9 aid spell
    • Increases Maximum HP by 40. [Max: 880]
  • The dragon uses Change Shape becoming a Medium humanoid
    • For the metallic dragons' Change Shape features, hit points are retained.
  • Potion of Giant Size
    • This doubles Maximum HP. [Max: 1760]

So simply finish off this dragon with Blackrazor and enjoy your 1760 Temporary Hit Points

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  • 1
    \$\begingroup\$ The tarrasque is indeed larger than Medium; it's Gargantuan. \$\endgroup\$ – V2Blast Mar 22 '18 at 6:57
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You can go up to 200 with the eldritch invocation Tomb of Levistus:

You gain 10 temporary hit points per warlock level (XGtE 57)

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