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Mystery Egg

“Bosses drop them now and then. Set it in the pets' nest and something hatches.”

Where to get it

Found inside:

Container	Qty	Chance per roll
Thornmother's Seedpod	1	4% (1 in 25)
Bramble King's Chest	1	4% (1 in 25)
Behemoth's Hoard	1	4% (1 in 25)
Tidelord's Coffer	1	4% (1 in 25)
Drake's Hoard	1	4% (1 in 25)
Sovereign's Vault	1	4% (1 in 25)

A gift from a regular when their loyalty reaches 1 and 4 heart(s).

What it's for

Set it in the pets' nest (it holds 2, more with the Bigger Nest upgrade) and 24 hours later it hatches (sooner with Warm Nest). Any kind of pet can come out, the later zones' rarer. Nobody knows what until it cracks:

Hatches into	Chance
Green Slime	6.1%
Goblin Scout	6.1%
Thornbloom	6.1%
Bramble Serpent	6.1%
Mushroom Cap	6.1%
Gloom Bat	5.1%
Cave Spider	5.1%
Cave Troll	5.1%
Deep Watcher	5.1%
Rockhide Brute	5.1%
Tide Imp	4.0%
Spinefish	4.0%
Deepfin	4.0%
Naga Warden	4.0%
Brine Lurker	4.0%
Cinder Imp	3.0%
Sunflare	3.0%
Magma Serpent	3.0%
Cinder Brute	3.0%
Magma Golem	3.0%
Rift Shade	2.0%
Violet Ooze	2.0%
Voidling	2.0%
Void Horror	2.0%
Rift Gargoyle	1.0%