NPC: Ynefarius
Long Desc: Ynefarius the demonic yak stands here, ignoring you.

Ynefarius, the offspring of some poor yak and a very sexually deprived
demon, stamps the ground at your approach.  He snorts derisively at you, as
if to say "don't even think about it."  Do you dare to attempt riding a
beast such as this?  Your sanity would be in question if you do.  He has
been known to not only kill, but eat most would-be riders.
He is a unique approximately 4'8" tall.

This NPC can be found in: Sigil.
  …in A Stall in Vendredi Stables.
*This NPC is stationary.
This mob is required by the following quests:
- Yak Maddness (25-59) from Lord Vendredi.
- Speed Kills (240-241) from Lord Agrippa.
- What A Rebel!! (60-119) from Lord Vendredi.
- Yak! Yak! Yak! (120-179) from Lord Agrippa.
- Horse Fever (10-59) from Lord Vendredi.