These zealots were placed into stasis on board the Spear of Adun. They were awakened in 2506 and took part in the End War. Their nerve cords were severed to negate the effects of Amon's corruption of the Khala. They are equipped with psi-enhancements and solarite reapers, ancient spear weapons that were stored with them.
The zealot is one of three melee warrior variants that the player can choose from in Legacy of the Void, along with the centurion and the sentinel. They are simply called "zealots" in the campaign, per the campaign's army customization system. The zealot has a Whirlwind ability where they rapidly spin in place when attacking, dealing splash damage to enemies around them. This gives them the highest damage output of the three zealot variants. The damage dealt by Whirlwind is low, making the zealot a "burst" attacker, best for fighting clusters of small enemies, in exchange for the centurion's support skills and the sentinel's longevity.
The zealot also has a different attack from the centurion and sentinel, doing one attack of 16 damage rather than 2 attacks of 8 damage. This makes them more effective against armored targets, as they have less of a damage penalty.
The zealot charges towards a target enemy unit or structure, boosting its speed to 8.47 for the duration. The zealot must have clear ground pathing to their target to reach it. Also increases the zealot's normal movement speed to 4.72.