Capital Planets

Capital Planets is an optional rule variant for Twilight Imperium (First Edition), introduced in the Borderlands Expansion
Immediately before the Political Phase of the third turn, every player must select 1 planet they control to become their Capital Planet and place a Capital Planet Counter on that planet. 
Capital planets have their resource values increased by 3 
As long as a player has a Capital Planet, they receive 1 extra credit for each Trade Agreement they have in play 
If another player takes over a Capital Planet, they immediately receive 15 credits and may add 3 permanent influence to their totals. This is signified by placing the conquered Capital Planet counter next to that player's individual player chart 
If a player loses their Capital Planet, they must immediately discard all action cards and half of their credits (rounded up). They also permanently lose 3 influence points 
A player may not regain their Capital Planet once it is lost