Rounds in Solar Sentinels follow the common rules of 20 Strong with the following adjustments:

ACTIVATION: MANDATORY ENEMIES

Some enemies’ names are printed in orange and feature a unique border. These cards are MANDATORY ENEMIES. When activating cards, if one or more mandatory enemies are on top of the stacks, you must choose one of those cards to activate.

CLEANUP: STACK DISCARD

During the Cleanup step, you must choose the top conflict card from one of the stacks and discard it. However, you cannot choose a mandatory enemy to discard. If all of the top cards are mandatory, do not discard a card that round. Mandatory enemies are not restricted from being discarded in other ways, such as through rewards or effects.