From LSWiki

Heat Resistance is DEAD! R.I.P. It isn't here anymore. Don't bother looking for it in-game.

Class: Resistance Skills
Attribute: Vitality
Pedagogy: Body Alteration
Practitioner Term: Heat Resistor

This skill represents the conditioning of one's body to resist being damaged by the amalgam heat and essences that partake of its
nature.

Heat resistance can be increased by exposure to heat damage, changing more quickly according to one's somatic adaptability.  It will
decay over time, weakening more quickly according to one's somatic adaptability.

See Also: heat tolerance, heat affinity

Trainers