In Brogue, I was surrounded by lava and 3 ogres who I definitely couldn't take on head to head, so I used a potion of fire immunity with the intention of running away through the lava. But the potion lasted long enough for me to safely poke the ogres to death from the lava with my +2 spear :D
Found another ogre that I couldn't outrun because of a goblin in the way, but I managed to survive thanks to an amulet of invisibility and an amulet of fire immunity:3