
I'm only level 20, my masteries are maxed out daft defender (18% dodge and disrupt chance) and 1 or 2 points in Defender (block chance). I put block in the title instead of disrupt, because it is easier to understand if you are not playing Warhammer online.
Hold the Line! ability: You focus your defenses against enemy fire, increasing your chances to dodge and disrupt by 45% for 12 seconds. You will also defend all allies behind you, up to 40 feet away, increasing their chances to dodge and disrupt by 15% as long as they remain at your back. Allies may have this effect stacked on them up to 3 times.
Shield Wall (rank 2 morale) ability: Gives you almost 100% block for 10 seconds
https://www.youtube.com/watch?v=rAdC2Ype8zM