Thorn Steed
Unknown.
0 
1000+
Damage taken
Resistant
60%50%
Immune
0%
Neutral
100%100%100%100%100%
Location
A dungeon here, accessible through the Desecrated Glade.
Immunity Properties
Paralysable✗
Sense Invis✓
Notes
It's the mount of the Thorn Knight and it looks like a Flamesteed. It's part of the Forgotten Knowledge Quest.
Strategy
Do not use Death Damage against it otherwise it will heal 10 times the damage it was supposed to receive.