The Oriental Shrine and Machine Altar appear randomly as boss rewards in all mazes. BEWARE: They can each only be used 3-4 times ever. Don't choose prizes carelessly.
This list is probably incomplete. You can use the save/load method to check if something works.
The Grim Reaper Statue / The Shadow StatueEditFind the shadow statue and use Alien Helmet,Curse Eyeshot or Devil's Right Eye to talk to it. It will teleport you to a level where you can collect 25 gems and some alchemy crystals. Speak to the statue and it tells you to defeat "Despicable Virginia" / "Night Lady Virginia" and return to it. Keep talking to the statue to get a stat upgrade.
- Crystal Turtle (immune to spells) - Crystal, Soul Crystal, and maybe Arcane Crystal
- Mole Miner (immune to physical damage) - Magic Iron, Dark Steel, and maybe Mithril
- King Solomon (only loses 1 HP when hit) - coins
- Little Fairy (Recover 20% HP each round) - Lizard's Spawn, Star Mint, Blue Crystal Gel