Opportunity
Description
By carefully striking at their foes, Sentinels work towards creating opportunistic attacks that can weaken their foes or grant themselves a chance to recoup. Any enemy that a Sentinel focuses attacks on will be easier to hit and will suffer an additional 5% damage from incoming attacks. Multiple Sentinels can work together to make this effect stronger. Occasionally, the Sentinel may find an extreme vulnerability in a target that can be exploited to deliver up to 25% additional damage against it for a limited time. Only one such extreme vulnerability may be exploited at a time.
Detail
Sentinels' attacks inflict a small defence and resistance debuff on any enemy. A Sentinel's "Opportunity" bar will fill up as the Sentinel attacks; when full, the Sentinel can use either their first or second primary power to inflict a much larger resistance debuff on a single target. If the first power was used, the Sentinel's own damage is increased; if the second was used, the Sentinel's health and endurance increases as they attack subsequently. In either case the boost lasts for 15 seconds.
Reference
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