This treasure contains one of the following items, and may give duplicates if you open multiple:
Arctic Hunter Set
Wings of the Paladin Set
Artisan of Havoc
Cryogenic Embrace Set
Moonshard Overgrowth
Might of the Thunder Ram
The Arch Temptress
Frostiron Raider Set
Traveling Tale-Teller's Set
Wyvern Skin
Incandescent Liturgy
The Maniacal Machinist
Impending Transgressions Set
The Corpse Maiden's Set
Dragonterror
And 430 others!
In addition, this treasure has a chance of containing:
Fire Lotus Belt
Golden Ornithomancer Mantle of the Benefactor
Dragonclaw Hook
Rainmaker
Pipe of Dezun
Perceptions of the Eternal Mind
Kantusa the Script Sword
Shattered Greatsword
Golden Gravelmaw
Drodo the Druffin
Golden Grasping Bludgeon
Golden Shards of Exile
Golden Staff of Perplex
Golden Huntling
Golden Severing Crest
Golden Sullen Hollow
Golden Lamb to the Slaughter
Lockjaw the Boxhound
Golden Doomling
Murrissey the Smeevil
Ice Baby Roshan
Lava Baby Roshan
Guard of the Red Mist
Axe of Phractos
Monarch Bow
Burning Fiend
Golden Nether Lord's Regalia Set
No seal or key is needed to open this treasure, as it is already unlocked. Within its confines lie treasures without equal.