This biome is filled with dead sculk and skulkium ore, almost no mobs spawn here at all but it isn't safe. There is a thick fog that shortens your sight, so be careful traveling through this biome. The lore reason for why the sculk is dead is that it was assimilated, it was frozen by the Cryodra and the wardens were killed off by the slicicles, who were more powerful than the warden back then. Strays and breezes can spawn in this biome.

Slicicle

A hostile mob that disguises itself as an icicle and waits until a player/mob comes by to kill it, they use their cryothite arms to slice or stab you, dealing the same damage as a diamond sword. they spawn in sculk remnants, ash canyons, and yeti domain, they're hostile towards pretty much anything that moves, except the warden (they run away from the warden if it's near). They can't be tamed at all and their lore is that they don't have any intellegence, their sole purpose is to kill and was given by the cryodra so it could kill all of the sculk in the dimension, but they ended up killing the cryodra because it wasn't specified for what they were meant to kill, which they killed the cryodra when they had the chance (the cryodra was starving).

Sculk Serpent

a soul-eating snake found only in the depths of the Sculk Remnants biome, it is hostile but rare and is kind of based on the bobbit worm. It can see but it can't hear, so it peeks out of holes that are 1 block wide, if you are close enough to one thats peeking out of a hole, it will jump out, grab you, and take you into its hole, where it will attack you until you die. it can reproduce but it doesn't make a baby or an egg, it splits itself into 2 and the cut off part will grow a head.

if it hasn't killed (or basically eaten) any mobs for 1 hour, it will lose its ability to see, which it will then use vibrations to find prey.