The Mimic Tooth Necklace is an A-rank passive item in Enter the Gungeon. True to its namesake, the Mimic Tooth Necklace’s passive effect revolves around converting chests and pedestals into Mimics.
Upon pickup, the Mimic Tooth Necklace will convert non-Mimic chests into Mimics, but will not affect Winchester’s minigame chests, rainbow chests, synergy chests, and glitch chests. However, chests found in Mirror Rooms will also be converted into a Mimic through the Mimic Tooth Necklace.
The Mimic Tooth Necklace only has one Synergy with one other item in Enter the Gungeon.
The Mimic Tooth Necklace is a very good item in Enter the Gungeon because of its ability to convert Chests and Pedestals into Mimics. Since Mimics guarantee a gun or item drop upon death, the Mimic Tooth Necklace effectively unlocks all Chests in the Gungeon and makes Item Pedestals accessible even without a key.
The Mimic Tooth Necklace can get even better if you pick up the Ring of Mimic Friendship as well. This combination will automatically unlock all chests (except for the ones mentioned above) in the Gungeon since the Ring of Mimic Friendship will cancel out the Mimic conversion that the Mimic Tooth Necklace applies on all chests in-game.
The Mimic Tooth Necklace features just one Synergy with one other gun in the Gungeon – Ruby Carbine.
The Ruby Carbine Synergy is an item synergy shared between the Mimic Tooth Necklace and the Hegemony Carbine.
Through the Ruby Carbine Synergy, the Hegemony Carbine’s bullets will set enemies on fire and gain a bounce effect.
The Mimic Tooth Necklace’s effects are passive, which means that having the item in your inventory will automatically convert all chests in the Gungeon into Mimics.
The only real challenge with this item is dealing with the Mimic that it spawns. Fortunately, Mimics aren’t that difficult to deal with in the Gungeon, and defeating these will almost always guarantee a gun or item drop.
The quality of the gun/item drop from defeating Mimic chests varies depending on the chest type. Regardless, you won’t ever have to worry about keys and unlocking chests around the Gungeon with the Mimic Tooth Necklace in your inventory.
The Mimic Tooth Necklace is one of the more valuable passive items in the game – well deserving of the rank it possesses in Enter the Gungeon.
The ability to automatically unlock chests and collect their contents after completing a quick challenge in the form of Mimics is a tradeoff that most players will welcome. After all, dealing with a minor monster is a small price to pay to never have to worry about keys and chests in-game.