2 items: Adds 1487 Penetration
3 items: Gain Minor Slayer at all times, increasing your damage done to Dungeon, Trial, and Arena Monsters by 5%.
4 items: Adds 129 Damage
5 items: After completing a fully-charged Heavy Attack, you and up to 5 group members gain Major Slayer, increasing your damage done to Dungeon, Trial, and Arena Monsters by 10% for 1 second for every 600 Spell Damage or 6300 Magicka you have. Roaring Opportunist can only affect a target every 22 seconds.
Maximum duration 12 seconds.