(La)
The Lairs.

Goblin Lair.
The goblin lair is usually occupied by 4 goblin swordmen and 4 goblin archers.
When destroyed, it will give 2 treasure chests.

Cave Troll Lair.
The troll lair is usually occupied by 1 Cave Troll. When it is destroyed,
4 treasure chests will appear.

Warg Lair.
Usually occupied by 2 Wargs. When destroyed, 3 treasure chests will appear.

Spiderling Lair
Usually occupied by 8 Spiders, though sometimes you only see 2 patrolling.
When destroyed, 3 treasure chests will appear

Barrow-wight Lair.
Occupied by 1 barrow-wight. WARNING! Barrow-Wights heal when they damage a unit!
Only use strong units to kill the Wight!
When destroyed, it gives 1 treasure chest and 1 level-up chest.

Fire Drake Lair.
Occupied by 1 Fire Drake. WARNING! Fire Drakes attack with a fire-attack, doing
massive amounts of damage to units. Killing a Fire Drake can cost you a 
batallion of soldiers easily.
When destroyed, it gives 1 treasure chest and 1 level-up chest.

- Untamed Allegiance.

Untamed Allegiance is an Evil Tier-2 Power availabe to Mordor and the Goblins.
When used on a lair, it grants you the possibility to build additional units.
The Goblins can build Wargs and Barrow-wights, while Mordor can build all 6 
additionally.

- Attack Trolls

Attack trolls (Mordor Troll Cage lvl 3) have the possibility to dominate other
trolls. When used, it grants the possibility to temporarily use the troll
just like your own units.

- Sharku

Sharku has the possibility to dominate Wargs and Warg Riders when level 2 or
higher. This works about the same as Attack Trolls.