They can be found in the Lighthouse dungeon (Games necklace tele to Barbarian Outpost and walk north).
There are Lev 74s and Lev 92s, the Lev 74s attack with a nearly useless ranged attack, whilst the Lev 92s use a weakish melee attack.
They attack as a group, so health can go down a bit quickly sometimes, so guthans is needed. Sometimes drop charms, raw fish, the Lev 92s can drop fremmenik helms, but this seems to be fairly rare.
There is sometimes a person or 2 here, but there is no real competition for Dags, there are plenty.