Upgrade for any unit: The attached unit has 0 Melee and 0 Ranged attack. (This overwrites any other upgrades or stat-boosting effects!)
Surrounding allied units have Armor 1 and +1 Melee attack. Surrounding allied buildings have Armor 1.
When the attached unit is killed, your Capital loses 2 life points.

On very rare occasions relics were brought to battle, carried on a carriage. Small relics could be carried by special leaders on their bodies.