PDS
LRR §63Rules Reference
A PDS (planetary defense system) is a structure that allows a player to defend their territory against invading forces.
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63.1Each PDS has the Space Cannon ability.
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63.2The primary way by which players acquire PDS units is by resolving either the primary or secondary ability of the Construction strategy card.
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63.3A PDS unit is placed on a planet. Each planet can have a maximum of two PDS units.
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63.4If a player’s PDS is ever on a planet that does not contain any of their own ground forces and contains a unit that belongs to another player, that PDS is destroyed.
ClarificationsSelect rulings confidence level
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A PDS is both a structure and a unit.
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Each PDS also has the Planetary Shield ability.
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Sources
LRR: Living Rules Reference §63tirules2: tirules2.comCommunity: TI4 Online Discord, TI4 Homebrew Hub Discord