Kil'joy drops

[Ebereasider]

20+ adds green hat
40+ adds bw hat, Robbins egg, crates, another firecracker type
60+ adds purple hat, Geng egg, 71 mythic rings, 2 more firecracker types
70+ improves chance to get vanities, eggs, crates, rings

Wait, where's pearcy's egg then? According to event guide that should drop too:

+ Higher level encounters with Kil'Joy mean a chance to loot more expensive fireworks, vanity dragon masks and rat pet (Geng, Percy, Robbin) eggs.