Mobs

29 new mobs, each with its own model (Blockbench sources in docs/art/models/). Zombies dig, spiders' eyes glow in the dark, and deeper levels spawn harder monsters. On a blood moon, frenzied undead, Ghouls and Revenants roam the surface.

The undead: bone lords, longdeads, shadow, invisible stalker, revenant, wight, ghoul	Demon spider, phase spider, black widow and wood spider in their cave
Clay golem, fire elemental and earth elemental	The gelatinous cubes: jelly, blob, ooze and pudding
Nightwing, giant vampire bat and vampire bat	Hoary silverfish, netherspawn and copperspine

A ghoul shambles toward you	Gelatinous cubes hopping closer	A fire elemental, alive
A Shadow blows out candles and breaks torches	A Jelly digests meat and leather on the ground; iron stays	Lightning heats an Earth Elemental: it burns and walks in lava
Water from a bucket or bowl hurts a Fire Elemental	Spider eyes glowing in the dark

Dire wolves

Dire wolves hunt in packs. Tamed, they wear a collar and dyeable wolf armour that cracks as it wears out.

A dire wolf pack on the hunt	Tamed: collar only, dyed armour, sitting	Wolf armour cracking as it wears out

Bestiary

Undead
Ghoul	Wight	Revenant (rusted iron armour)	Shadow (deep, immaterial)
Invisible stalker (outlined)	Longdead	Longdead guardian	Bone lord
Ancient bone lord
Spiders
Wood spider	Black widow	Phase spider	Demon spider
Elementals and golems
Clay golem	Earth elemental	Fire elemental (Nether)	Infernal creeper
Gelatinous cubes
Jelly	Blob	Ooze	Pudding
Bats and silverfish
Vampire bat	Giant vampire bat	Nightwing (Nether)	Copperspine
Hoary silverfish	Netherspawn
Wolves
Dire wolf	Hellhound (Nether)