Frost Goblin Dungeon Exploration 3
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From what I've investigated, the monsters in this place are all related in the evolutionary sense.
Frost Goblins evolve into Frost Goblins with a "job" after increasing their Stage one or two times, and then, after that, they evolve into Ice Orcs. After an Ice Orc reaches Peak Stage… they evolve into the powerful Old Yeti.
I guess it is gradual, they're all blue-skinned and are slowly growing white fur across their bodies, when the giant and burly Ice Orc evolves, their entire bodies grow up to four meters and their muscles become bigger, they are completely covered by white fur and resemble gorillas standing up. They usually wield a giant ice club they make with magic.
One of them spawned on floor 1, it seems that they randomly appear in the floor's last room as a Mid-Boss. The last Boss of the Dungeon is often a similar Old Yeti or their superior evolved version, the Old Yeti King who are Rank 2 Initial Stage.