The Lizard King is a boss on Nork -2 accessed via a teleport in the southwest corner. This quest rewards a permanent +1 CON the first time you complete it.
Requirements
Access to Nork -2
Ability to kill the Lizard King
Walkthrough
Find Sir Haldan — a wandering NPC in Nork Town (he occasionally falls as far as N-4 or the VT climb-down). Say “Sir, oath”.
Find Annalie — another wandering NPC in Nork Town. Say “Ann, wards”. She tells you to kill the Lizard King.
Travel to the southwest corner of N-2 and stand on the teleport hex.
You are teleported into the Lizard King's lair. Kill him.
Loot his Doll and Gold Ring (the ring is a level 4 Fire/Ice ring).
Return the Doll to Annalie and say “Ann, doll”.
Rewards
+1 Constitution (permanent, first time only)
Gold Ring — level 4 Fire/Ice protection
Glowing Mace (from the lair)
Tips
Annalie moves to a new location each time she completes a trade.
The +1 CON is only awarded the first time — repeating the quest won't give additional CON.