Possible Vampire Character

Just some thoughts I had regarding a new vampire champion. I am interested with the idea of a character that sacrifices some time to empower his/her abilities, and if caught while "entombed" was very vulnerable, but if the pull it off the reward is ridiculous.

Vampire character:

Passive: Auto attacks deal magic damage based on .5 AP ratio, This increases to a 1.1 ratio while Empowered.

Q(12s/11s/10s/8.5s/7s): Sucks life of opponent, melee range, target is entangled for the duration (.5s) then afterward for vamp to peel off (.5s). Empowered: Target is suppressed, Duration from .5 seconds to 1 second each, damage tripled, slight range increase.

W (7s/6s/5s/4s/3s): AA reset, deals additional damage slows by 15%/20%/25%/30%35% for .75 seconds. Empowered: Is a stun for 1.5s, damage is doubled.

E (18s/16.5s/15s/12.5s/10s): Glide ability, glides with 2/2.4/2.8/3.2/3.6 times your move speed to a target location (medium range) Empowered: Range doubled, turn into a flock of bats, untargetable for the duration of the glide.

R: Channel, “Entombed”(suppressed, nearsighted) for 30s, (2s to enter, 2s to exit the state) but SUPERPOWERS his other abilities (Passive gold generation tripled while “Entombed”), super powered abilities last for 1.5/2/2.5 mins (Nothing empowered if canceled early, can be canceled early with a 2s delay).