Mossy Mammoth

You must enter the named Zskera Vaults in order across multiple weeks: Az, then Ur, then Ix, then Kx. You do not need to open every door inside — just enter the main room each week to progress your eligibility.

Combine Strange Petrified Orb with Scrap of Black Dragonscales using the Reversing Petrification spell to produce Particularly Ordinary Egg.

Combine the Particularly Ordinary Egg with Drop of Blue Dragon Magic to produce Magically Altered Egg.

Combine the Magically Altered Egg with Everburning Ruby Coals to produce Egg of Unknown Contents.

Combine the Egg of Unknown Contents with Speck of Bronze Dust — found in the unnamed (post-named) Zskera Vaults after completing all four named vault weeks — to produce Sleeping Ancient Mammoth.

Combine the Sleeping Ancient Mammoth with Emerald Dragon Brooch, also found in the unnamed Zskera Vaults, to produce the Mossy Mammoth mount.