First Strike: When one Unit in a combat has First Strike and the other doesn’t, the one with First Strike deals damage first, and the other Unit only deals damage back if it survives.
Double Attack: This Unit deals damage a second time if it attacks and survives the first combat.
Armor X: Each time this Unit suffers damage, Armor X prevents the first X points.
Aggressive X: This Unit has +X Strength while you have Initiative.
Overrun: If this Unit attacks and deals more combat damage than its blocker can survive, the excess is dealt to the opposing player.
Regenerate: This Unit heals all damage at the end of each turn.
Evade: This Unit ignores all effects of the next enemy Power that targets or affects it, but then loses Evade.
Airborne: This Unit cannot be blocked unless the blocker has Airborne.
Double Block: This Unit may block two different Units at the same time.
Vanguard: This Unit may both attack and block at the same time.
Stun X: A Stunned Unit can neither attack nor block for X turns.
Can’t Attack X, Can’t Block X: If a number appears after these effects, it means they’ll wear off in that many turns. If there is no number, the effect lasts indefinitely.
Summon: (some effect): This effect happens upon the Unit entering play.
Last Breath: (some effect): This effect happens upon the Unit dying.
Attack: (some effect): This effect happens each time the Unit attacks.
Block: (some effect): This effect happens each time the Unit blocks another in combat. (Merely giving the Unit a block order does not trigger the effect.)
Infiltrate: (some effect): This effect happens each time the Unit attacks and isn’t blocked.
“Strongest”, “Weakest”: These refer to the Unit with the highest or lowest Strength, respectively. Ties are broken by Health, and then if there’s still a tie, at random.