Warg Deepwater is an Alliance Fishing trainer located in The Loch in Loch Modan.
He is at the dwarf house built into the hill, next to the boat dock at the lake. He moves: sometimes he is inside the house, sometimes outside on the porch.
You can learn Fishing here and train up to skill 150. Past 150 you need the book Expert Fishing - The Bass and You, sold by Old Man Heming in Booty Bay, Stranglethorn Vale.
Loch Modan
Warg Deepwater
