The Chief Warden (click for map image) spawns in the city (PH "a gruff warden").
For your "arginhiz.txt" map file (note for all Argin-Hiz named map points, see this quest entry):
The Chief Warden casts "Fleet of Foot" (2-tick buff for Dodge increase); "Furious Bladework" (hatelist-based 50' range AE for 40,000 dmg); and "Warden's Slash" (single-target DD for 40,000 dmg + 5-tick snare).