Sleigher is a common researcher from the Supreme Santa event. They automate and speed up Sleighs.

Sleigher Speed Dark Science cost Copies Needed
Level 1 x48 Free 1
Level 2 x144 100 5
Level 3 x432 200 10
Level 4 x1296 300 20
Level 5 x3888 400 50
Level 6 x11.66k 800 100
Level 7 x34.99k 2000 200
Level 8 x104.97k 4000 400
Level 9 x314.92k 8000 800
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