Idol of Fire

From the Super Mario Wiki, the Mario encyclopedia

Idols of Fire are obstacles that appear in the Donkey Kong Adventure mode of Mario + Rabbids Kingdom Battle. They are obstacles that act on their own turn, during the transition between the heroes' and the enemies' own turns; on their turn, they move to the closest character from their position, Burning them. This is unlike their normal counterparts, which instead Bounce characters. Once a level's objective is cleared, the Idols of Fire will "deem the heroes worthy" (according to Beep-0) and stop attacking.