Why not give the 'Fex similar to a combat drugs thing? That way you can have options: 1. Moves an extra 3" in the shooting phase 2. Gains A+1 3. Gains WS +1 4. Gains FNP (maybe overpowered...) 5. Gains I +1
Then have the same for normal combat drugs, for each ability you take, roll a d6, for a double, take a wound (no save), for a triple, take 2 wounds etc etc...
eg, if you took all 5. You would roll 5 die. Assume you got 22333 you would take 3 wounds, 22335 would mean you take 2 wounds etc etc???
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