Killroy's Slaughterhouse
Killroy's Slaughterhouse is a weekly challenge accessed from Killroy in the YumYum Grotto where you are given two randomized selections of rooms (the second selection room unlocks after reaching World 4). The random factors are which class can enter and what the enemy will be fighting, the map is the same as the mob's spawning area. Killing enemies within these challenges will award the player with Talent Point Tab's and "Skulls" which act as a currency for the Skull Shop, also provided by Killroy. When the challenge resets your Skulls will also be reset.
Rooms can be reset using Airhorn for 300 
.
Skull Shop
The Skull Shop offers the following selections:
| Cost | Reward | Amount | Notes | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 5 | Random Time Candy | 1 |
| ||||||
| 9 |  Black Pearl |
1 | |||||||
| 10 |  Holy Pearl |
1 | |||||||
| 3 |  Next Kill Spawns a Crystal Mob |
||||||||
| 6 |  Dungeon Loot Dice |
1 | |||||||
| 4 |  Arcade Balls |
6 | Automatically applied | ||||||
| 8 |  Library Checkouts
|
2 | Automatically applied | ||||||
| 1 |  Refinery Cycle |
Automatically applied | |||||||
| 8 |  Pet Eggs |
2 | |||||||
| 5 |  Cooking Ladles |
3 |
Room Upgrades
After time's up in any battle you'll be granted to choose one of the three "Upgrades" which are permanent for all future runs that boosts your progress/rewards within room:
| Upgrade | Description |
|---|---|
| +1 second timer | Increases your maximum time in room |
| +Talent Drops | |
| +1% bonus skulls | Adds 1% bonus skulls to your total skull reward |
