Damage and Discipline
Played a match and honestly the guy didn't explain it well and I still don't understand. He used Ruined Rex's deathmill to deal 4 damage to my purple vex (4 might). So in response I used discipline to give her plus 2 might to make her 6. So in my mind she's at 2 might cause the whole point from my perspective is a units health/damage is their might. But he was saying they're 2 different things? And the vex would still die i guess.