Just want to be sure it's as intended but both of their Q's do not proc when attacking towers or inhibs. I have to say - it would be really nice to have a detailed list of which champs do or don't proc. This way, people like me don't feel stupid when asking if its "working as intended."
ModWulf Helhammer1 votesDon't know about Shyvana, but for Ashe, her Q stacks will be maintained on structure hit, and she can use her flurry on structures, but she can't get any stacks from attacking them
J3R3MYism1 votesso with ashe, you dont get more stacks on her passive for the q but when you activate the q it does do more dmg to towers and inhibs. as for shyvana i dont think the q does more dmg to towers but it is for the auto reset, another champion that does more dmg to towers with an ability is talons q, it is similar to shyvanas but from what i understand it does more damage on top of the auto
Crys3s1 votesThere is another champ who's q comes into question. I think 
is another example? I'm not sure...
ScabberDeath1 votesI believe you're referring to his E, which knocks them up and does damage not the pull, right?
His E does work on towers and does the bonus damage.
Deep Terror Nami1 votesShyvana can use her Q to reset her auto attack and do more damage to a turret. Whether it procs the bonus damage or only resets her auto, I am unsure.
Ashe can maintain her Q stacks by attacking a tower, but the number never goes up only refreshes the current amount (whether 0 or 4), and she does not proc her bonus "crit" damage because she can't slow a tower. Her Q active does work when attacking a tower.
Crys3s1 votesI understand the crit - I think its interesting she maintains stacks but cannot gain - if that is what you are saying.
Deep Terror Nami1 votesYes, it's just like Draven's Axes.
Phoenix Kotori 1 votesShyvana Q does work on towers, iirc but the autoing to reduce it's CD doesn't.
Marthian1 votesUnless it changed recently, Shyvana does proc her Q on on structures. It hits twice (the second hit deals reduced damage until r5) and procs on-hit effects twice (why she does great with on-hit effects.) Dragon form Shyvana, I believe also procs twice, but not sure.
JustMyBassCannon1 votesTo clarify for everyone else; the OP is talking about the on-hit effects of Ashe's and Shyvana's Qs. Ashe's Focus stacks do not build up on attacking towers, and Shyvana's Twin Bite does not proc the CD refresh on attacking towers.
That out of the way; I totally agree, abilities need to have some simple denotation for whether or not it applies to structures.
Although, Ashe's should be a little bit obvious, because her Frost passive doesn't apply to towers (otherwise she might start critting towers...)