Abilities of Rek'Sai
Spell skill priority is an important winning factor for Rek'Sai. Understanding the abilities of Rek'Sai in League of Legends is another. Below you can find all the relevant information on Rek'Sai abilities. In order for item builds you should check the build for Rek'Sai.
Passive: Fury of the Xer'Sai
Rek'Sai generates Fury by Attacking and hitting with basic Abilities. She consumes this Fury while Burrowed to restore health.
Queen's Wrath / Prey Seeker
Rek'Sai's next 3 basic attacks deal bonus Physical Damage to nearby enemies.While Burrowed, Rek'Sai launches a burst of void-charged earth that damages and reveals enemies hit.
Unburrowed: Rek'Sai's next 3 Attacks within buffduration seconds gain attackspeed*100% Attack Speed and deal an additional totaldamagetooltip physical damage to nearby enemies. Attacks refresh the duration of this Ability.
Burrow / Un-burrow
Rek'Sai burrows into the ground, gaining new abilities and increased Move Speed. Her vision range is reduced and she cannot use basic attacks.While Burrowed, Rek'Sai may cast Unburrow to knock up and damage nearby enemies.
Unburrowed: Rek'Sai burrows into the ground, gaining access to new Abilities but cannot Attack. She gains burrowedmovespeed Move Speed, visionradiusmod*-100% reduced vision range, and nearby enemies that move and are otherwise unseen will have their positions revealed to Rek'sai and her allies.
Furious Bite / Tunnel
Rek'Sai bites her target, dealing bonus damage if she has max Fury.While Burrowed, Rek'Sai creates a re-usable, long lasting tunnel. Enemies can destroy it by standing on top of either entrance.
Unburrowed: Rek'Sai bites a target, dealing spell.reksaie:basedamagetooltip physical damage. At max Fury, the bite deals an additional spell.reksaie:furymaxhealthdamage*100% max Health physical damage.
Void Rush
Rek'Sai passively marks targets by damaging them. She can activate this ability to become briefly untargetable and lunge at a marked target for heavy damage based on their missing health.
Rek'Sai targets an enemy damaged by her in the last preymarkduration seconds and then dives underground, becoming Untargetable. Moments later, she leaps unstoppably at her target, dealing rbasedamagecalc plus percentmissinghealthdamage% missing Health physical damage.
FAQ on Rek'Sai
What do you max first on Rek'Sai?
Most Rek'Sai pros max out 
Queen's Wrath / Prey Seeker first.