SIVA Crisis Heroic

SIVA Crisis Heroic is a Light level 350 Vanguard strike playlist that will launch a random strike played with the Heroic modifier and three other modifiers that change every week at the Weekly Reset. There are three tiers (Bronze, Silver, Gold) that can be achieved by reaching a certain point threshold by killing enemies in the strike. Only gold tier gives you a chance at different rewards.

Rewards
The following rewards are obtained upon completion of a match in the SIVA Crisis Heroic playlist:
 * 10 Legendary Marks (three times per week per account)
 * 1 Treasure of Ages (once per week per account)
 * 1 Skeleton Key (around 30% chance, only if reached gold tier)