Killroy's Skull Shop is a Legends of Idleon shop: sells 6 items.

Killroy's Skull Shop | Idleon Toolbox

Killroy's_Skull_Shop

Hold down to boost all your kitchens ahead by 1 hour for each ladle in this stack. The entire stack will be used up when you do.

Cooking_Ladle

Loot_Dice

Hold down to gain 20% EXP in the skill that's shown in the corner of the screen. If you're in a town, you will gain EXP in the town skill. Only works on skills below level 30.

Black_Pearl

Hold down to gain Class EXP. The amount you gain is based on your Class LV.

Holy_Pearl

Hold down to instantly incubate eggs for your nest in World 4. It'll only use up eggs that you have space to carry, dont worry about wasting these!

Mob_Egg

Hold down to instantly get 1 Hour of AFK Gains.