Exploding from too many temp HP?

[InterstellarPro]

So, if a creature visits the positive energy plane, they may build up so much positive energy that they explode in a "riot of energy" if they fail a fort save after gaining a number of temp HP greater than their normal max HP. Is this limited only to Positive-Dominant planes? Or can it happen if a low-con psion uses Vigor too vigorously on the Material plane?

[Celestia]

As far as I know, this is unique to the positive energy plane.

[Nifft]

So, if a creature visits the positive energy plane, they may build up so much positive energy that they explode in a "riot of energy" if they fail a fort save after gaining a number of temp HP greater than their normal max HP. Is this limited only to Positive-Dominant planes? Or can it happen if a low-con psion uses Vigor too vigorously on the Material plane?

It's specifically a planar hazard.

It's easy to get more temp HP than your normal max HP, especially for a low-Con character. There's no negative consequence for doing so normally.

[Goaty14]

As far as I know, this is unique to the positive energy plane.

^It's a planar trait, thus, it will only be activated by things that manipulate planar traits, such as certain monsters, planar bubble, and planar shepherds.

[InterstellarPro]

I remember reading where someone mentioned an animal that would cause characters to gain temp hp and explode, but I cannot seem to find it. Does anyone know what I am talking about, by any chance?

Edit: Found what was mentioned. The vivacious template from the Planar Handbook.

[The Viscount]

This effect is similarly found in the Glimmerskin from MM2, who also hails from the Positive Energy Plane.

[Necroticplague]

This effect is similarly found in the Glimmerskin from MM2, who also hails from the Positive Energy Plane.

IIRC, Vivacious creatures (also native to the PEP) can do something similar.

[Elkad]

It's easy to get more temp HP than your normal max HP, especially for a low-Con character. There's no negative consequence for doing so normally.

This. My Ardent has 33hp at 10th level. I usually put Vigor on in 20hp chunks and trust to being fast(75' base, 125' Haste+Xeph Burst) to work the edges of the fight, but if we meet a dragon or something, I put the whole 50 on.

[ShurikVch]

I remember reading where someone mentioned an animal that would cause characters to gain temp hp and explode, but I cannot seem to find it. Does anyone know what I am talking about, by any chance?Dunno about Animal, but Thoon Infiltrator is able to apply Thoon Thrall template to Humanoids; Thoon Thrall gets Overdrive Healing (Su) (which works kinda like a PEP effect), and Immolate SA (which is PE-induced explosion for 3d6 damage in 10' radius, +1d6 for every Thoon Thrall or Thoon Infiltrator withing 30')