(First floor.) Ration of Food blocks the door. Mage pretty much starts with everything you need to solve that room.
Edit: This seed is crazy, already with artifact and wand on the first three floors. LBX-MZH-SYDv2.5.2 (Mage; On Diet&Faith Is My Armor&Forbidden Runes)
I guess. It’s just such a miniscule thing to be pleased with. You can throw anything you find on floor 1 at those traps to trigger them except a potion.