The Spore Mushroom is a floor placed Misc Trap introduced on Stairs of Doom, level 23. This trap converts the first enemy that steps on it to your cause. It will only work on one enemy at a time at but it will work on any enemy in the game. When the trap's victim dies, it will eventually reset itself, ready to be used again. It can be upgraded to give converted enemies increased HP.
| Overview of defenses in Orcs Must Die! | |
|---|---|
| Weaponry | Alchemist Satchel • Bladestaff • Crossbow • Flame Bracers • Ice Amulet • Lightning Ring • Vampiric Gauntlets • Wind Belt |
| Floor traps | Barricade • Boom Barrel • Brimstone • Coinforge • Decoy • Floor Scorcher • Spike Trap • Spore Mushrooms • Spring Trap • Steam Trap • Tar Trap |
| Wall traps | Arrow Wall • Grinder • Mana Well • Push Trap • Wall Blades |
| Ceiling traps | Autoballista • Pounder • Shock Zapper • Swinging Mace |
| Guardians | Archer Guardian • Paladin Guardian |
| Pre-placed | Acid Cauldron • Ballista • Chandelier • Boiling Cauldron • Rolling Log |