Guild Wars 2 Berserker's Scallywag Chest of Strength Item

Superior Rune of Strength
(1): +25 Power
(2): +10% Might Duration
(3): +50 Power
(4): +15% might duration; 25% chance when struck to gain might for 5 seconds. (Cooldown: 5s)
(5): +100 Power
(6): +20% might duration; +5% damage while under the effects of might.