Spawn Loc is 60, -300 in The Head of the Snake.
The spell he casts does not show in log, but this is what I can see.
[Wed Aug 17 01:12:00 2016] Grinder begins to cast a spell.
[Wed Aug 17 01:12:00 2016] You are stunned!
[Wed Aug 17 01:12:00 2016] The ground leaps up and smashes you in the face. You have been healed for 6 points.