Collector units take trophy tokens whenever they eliminate a unit.
The trophy tokens collected by a particular unit are described after the Collector keyword. In this expansion, Black Ears units collect ear trophy tokens as noted by their Collector (ear) keyword.
Collector units receive a number of trophy tokens equal to how far morale has shifted after eliminating a unit. The trophy tokens are placed on the Commander card with the same House trait as the unit. If there is more than one eligible commander, the controlling player may choose which Commander card to put the trophy tokens on.
Trophy tokens are used on specific cards to trigger numerous abilities. In this expansion, Chella in particular utilizes trophy tokens to receive bonus orders for her units.
Whenever they eliminate a target Unit, Collector Units take a number of Trophy Tokens equal to the shift in Morale caused by the elimination of the target Unit. The Trophy Tokens are then placed on the Commander Card of the player's choice (as long as that Commander is from the same House as the Unit that Collected the trophy Tokens) and the Trophy Tokens can then be discarded to trigger Abilities, such as Chella's Commit Ability, as well as some Leadership Card effects.