Mine Fields

Mine fields are an optional rule variant for Twilight Imperium (First Edition), introduced in the Borderlands Expansion
== Purchasing and Placing Mine Fields ==
Mine Fields may be purchased during the Purchase Units Phase for 5 credits each 
A Dreadnought can place 1 Mine Field per turn instead of moving
Mine Fields must be placed the turn they are purchased or they are returned to the supply 
There are 20 Mine Field Tokens. No more than 20 may be in play at a given time and no system may contain more than 3 mine fields at a time
Mine Fields can never be moved and always remain in the system until detonated
== Effects of Mine Fields ==
Mine fields affect the next fleet to enter their system (even if it is of the race that placed them) 
The effect of mines is determined between the Movement and Space Battle Segments 
Two dice are rolled for each Mine Field:
* 2-13: No effect 
* 14-17: 1 Hit 
* 18-19: 2 Hits
* 20: 3 Hits 
If the first Mine Field destroys all incoming ships, the remaining Mine Fields are unaffected
If one or more ships survive, the next mine field detonates 
When detonated, a Mine Field is returned to the stack
== Empires End Variant ==
When using the Empires End Variant introduced in the Distant Suns Expansion, the Damage chart for mines is altered:
* 2-10: No effect
* 11-15: 1 Hit 
* 16-18: 2 Hits
* 19-20: 3 Hits