Information:
The biggest and ugliest of the group is the Matriarch. They hit harder than they did prior to UO:R and they have a ton of mana and can cast mini combos (Explosion+Cor Por) and machine gun Magic Arrows and Poison when you least expect it. They have learned to heal and cure themselves and other Terathans around her. And since they tend to spawn in with other Terathans, be wary.

How to kill:
Bards: Provoke them onto other Terathans, then use magic or a bow. This is the most efficient way of killing them. Just beware of other Warriors/Avengers spawning in and have your Peacemaking macro ready.
Archers: Same as the Avengers.
Mages: Cast alot of flamestrikes and energy bolts. I have seen her take alot of spells and keep coming. And since they heal themselves, be prepared for a longer fight than before. Note: Trapping does NOT work on her. She finds a way to get at you.

Loot:
600+ gold, chance of magic item, chance of level 4 treasure map, most of the time a moonstone.