Rek'sai buffs
I think that Rek'sai can use some "minor" buffs.
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Unborrowed Q buff- after Rek'sai finishes "Queen's Wrath" Rek'sai is set in a frenzy and gains bonus attack speed, as well as deals true damage for a set amount of time.
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Burrowed W buff- Rek'sai's W scales off of her health and attack damage. After unburrowing Rek'sai gains physical damage reduction for a short amount of time. While burrowed Rek'sai can detect stealthy traps as well, the range she can see it can be two feet ahead of her.
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Burrowed E buff- there is a slit chance that a Zz'rot minion can escape from Rek'sai's tunnel. After exiting a tunnel Rek'sai gains a movement speed boost. Unburrowed E buff- Rek'sai's E damage scales wither her health and attack damage, as well as healing for the damage dealt. Healing is doubled if Rek'sai deals true damage.
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R buff- if an enemy destroys a tunnel the enemy is marked and given true sight.
Some of these buffs may have been a bit overboard, but Rek'sai can use some buffs as well as skins in some way or form.