An attack must target a valid, unprotected target within the applicable point range.
The protection ratio is x3 in PVP and x3 for PVE interactions with the Errants. A ratio exactly equal to the limit remains allowed; an attack is refused only when the point spread strictly exceeds that limit.
An attack can therefore be refused if the target is:
- too strong for the limit in that context;
- too weak for the limit in that context.
In PVP, the same restriction also blocks Espionage by probe or drone.
An attack cannot target the source planet itself. Another planet belonging to the same player may be targeted if the mission is otherwise valid. These eligibility rules are distinct from the pre-combat protection that may remove a fleet docked at the target (see Pre-combat protection for a docked fleet).

