Sabotage Run

The Sabotage run is an optional variant that may be included in a game of Twilight Imperium Third Edition
They allow a player to potentially destroy a War Sun with their Fighters before Space Combat begins 
The process is as follows: 
(1) During the "Pre-Combat abilities" Step of a Space combat, a Sabotage run may be announced by each player (starting with the attacker)
* If both fighters commit to a Sabotage run, the attacker's is resolved first 
(2) Players commit Fighters to a War Sun and roll 1 die for each fighter committed.
* 1-8: That fighter is destroyed
* 9 or 10: The War Sun's Outer Defense is penetrated and each Fighter that succeeded may roll again
(3) Any Fighters that survived may roll again:
* 1-9: That fighter is destroyed 
* 10: The War Sun's Inner Defense is penetrated and that War Sun is immediately destroyed with no return fire
If the War Sun survives it participates in the battle as normal (i.e. retains Sustain Damage ability)