Heat Sense

Heat Sense is a power displayed by Flame Princess, first shown in "Vault of Bones." This abillity allows Flame Princess to detect artificial objects in a nearby area. In "Vault of Bones," after Finn was unable to find a secret switch for the dungeon, Flame Princess used this abillity to "scan" the nearby area, discovering an artifical tree nearby, which Finn then used to open up the dungeon.

Trivia

 * This abillity may work on detecting how flammable the various materials are in the detection area, as different molecular compounds and structures have different ignition points.