Why nerf Shyv's Q and not her E?
Shyvana's Q makes her next basic attack strike twice. Now- I'll admit the scaling was tight- at a 5% increase each level ending at 200%. But- her real damage output is from her E- which makes her basic attacks deal additional damage based on the target's max health. This is why Devourer and BorK work so great with her. The 'debuff' from her E lasts for 5 seconds. The CD of her Q is reduced 1 seconds upon her basic attacks.
The damage of the Q isn't what's eating us up- it's the damage from her E and how many times she can land an attack while the debuff is up. If Shyv lands a Q immediately after landing her E, she can land another Q before the debuff runs out. Meaning- the additional damage from the debuff is proc'd twice on one hit- regardless of the actual damage being dealt from the attack.
With a full build- a Shyvana can land her Q AA on a marked enemy at least 3 times. If Shyv is Sated, then we're seeing more on-hit bonus true damage. Within the 5 seconds of Shyvana's mark, you can be struck by her more than 12 times. Regardless of the base damage- 12 times the % true damage added is overwhelming.
If Shyvana has 5 "Krug stacks", she can use "Flame Breath" to initiate, hit her Q, AA the marked enemy- stun them, and unleash enough force to be able to finish them off quickly. All because basic attacks against marked/debuffed enemies deal % Health in bonus true damage.
Let me re-say that. PERCENT HEALTH BONUS TRUE DAMAGE PER HIT & ON-HIT EFFECT
Sated Devourer and Twin Bite really abuse this ability.