[RPG] Do fire spells cast underwater still affect creatures vulnerable to fire

dnd-3.5emonstersspells

Related Question: Can magic items that deal fire damage function underwater?

As mentioned in the above question:

From the DMG p93:

Spells or spell-like effects with the
fire descriptor are ineffective
underwater unless the caster makes a
Spellcraft check (DC 20 + spell
level). If the check succeeds, the
spell creates a bubble of steam
instead of its usual fiery effect, but
otherwise the spell works as
described. A supernatural fire effect
is ineffective underwater unless its
description states otherwise.

For creatures that have damage reduction x/fire or regenerate damage except that done by fire, do they treat the bubble of steam the same as fire or not? eg Would a Water Troll regenerate damage from a fireball cast underwater?

Best Answer

If the check succeeds, the spell creates a bubble of steam instead of its usual fiery effect, but otherwise the spell works as described.

Sounds like fire damage to me, but you're burning them with superheated steam instead of flame.

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