Fire resistance

Fire resistance protects against most fire damage and the majority of hot objects, but it will not prevent potions from boiling or scrolls and spellbooks from burning, nor will it prevent non-fireproof armor from becoming burnt. It is a must-have before hitting Gehennom, as fire traps are prevalent there and capable of reducing your maximum hit points.

Sources

Fire resistance can be obtained from eating the following corpses (along with the odds of getting the resistance), listed in the order you might find them in the game:

• Gelatinous cube: 10%
• Red mold: 3%
• Gray ooze: 7%
• Fire ant: 20%
• Red naga hatchling: 10%
• Pyrolisk: 20%
• Fire giant: 30%
• Red naga: 20%
• Chromatic dragon: 17% (Caveman quest only)
• Ixoth: 100% (Knight quest only)
• Lord Surtur: 50% (Valkyrie quest only)
• Red dragon: 100%
• Salamander: 53%
• Hell hound pup: 47%
• Hell hound: 80%
• Wizard of Yendor: 25%