Class
C
Ci'th Stone Location
Sulyya Springs – Ceiling of Sky
Mark
Uridimmu
Mark Location
Sulyya Springs – Subterranean Lake
Reward
Cobaltite
Secondary Reward
5 Bomb Shells
Stone Type
Waystone
Unlock Condition
Complete Mission 18: So Close, Yet So Far
This Waystone is not the most useful one, unless you don't immediately return to Mah'habara upon your arrival in Sulyya Springs, but it's easy to find, so there's no reason not to complete the Mission. You'll fight four Uridimmus, found at the top of the Treasure-laden "upper" area.