8 months ago - Mark_GGG - Direct link

"Damage Types" in path of exile are Physical, Fire, Cold, Lightning & Chaos (there's also technically Darkness, sort-of).

Attacks, projectiles etc are ways damage of any or all of these types can be dealt, but they are not damage types.

The Ngamahu passive skill transforms modifiers that apply to damage types other than fire to instead apply to fire damage. It does not change anything else about those modifiers, such as being restricted to attacks, or other conditions for getting the bonus to apply.