However, it can be used to unlock the special rat chests after the boss fight.
![enter the gungeon heart bottle enter the gungeon heart bottle](https://66.media.tumblr.com/4f47b57657956e09d50402457372303f/tumblr_pgejh09LEX1ujkqcgo1_500.png)
The drill cannot be used on any chests that spawn after clearing a wave in the special drill room.If it is in the center of the room it will remain. If the player wants to keep them, they must grab them before they finish all the waves otherwise, when the room returns to its normal size, the pickup may vanish, if the walls close over it. It is possible for pickups to spawn after completing a wave, including other chests.‘s chancellor, who will chase the player even if left unharmed. The same applies for Old King’s chancellor when used in the Abbey of the True Gun. When the drill is used in the Keep of the Lead Lord, there’s a chance for it to spawn Bullet King.They usually have at least 4-5 enemies per wave, but can occasionally spawn 6. B tier (green) chests can have anywhere from 2-4 waves. D tier (brown) chests will have a single wave, with 2-4 enemies.
![enter the gungeon heart bottle enter the gungeon heart bottle](https://64.media.tumblr.com/bb24b6f478f2a928252f8fff543f82c6/tumblr_p7wbcjXZfu1wauzoyo2_400.jpg)
The amount of enemies and waves is determined by the chest quality, usually having less enemies and waves when used on low-quality chests, and up to 5 waves for S quality chests.Picking up Drill increases the chance of finding the other Payday 2 items, Loot Bag and Clown Mask.