Tier 1
VOID -
VOID -
VOID -
Tier 2
VOID -
Opportunist - While waiting to Counter an ability after casting 
Spear Hand Strike or 
Power Strike, 
Hit Combo is generated twice as fast.
VOID -
Tier 3
Blessing of Xuen - While at 
10 stacks of 
Hit Combo, Taran Zhu deals 
30% more basic attack damage.
Blessing of Niuzao - While at 
10 stacks of 
Hit Combo, Taran Zhu gains an additional 
5 Armor.
Blessing of Chi-Ji - While at 
10 stacks of 
Hit Combo, Taran Zhu refreshes 
Chi an additional 
25% faster 
(Chi refreshes in 10 seconds).
Blessing of Yu'lon - While at 
10 stacks of 
Hit Combo, Taran Zhu heals for 
2.5% of his maximum health when damaging an enemy with an ability.
Tier 4
Dampen Harm - See above.
Tolling Bell - See above.
Tier 5
VOID -
VOID -
VOID -
Tier 6
Shado-Pan Resilience - Being Stunned, Silenced, or Rooted grants Taran Zhu Unstoppable for 
2 seconds. This effect has a 
40 second cooldown, which recharges 
10% faster for each stack of 
Hit Combo Taran Zhu has.
VOID -
Diffuse Magic - Adds 
Diffuse Magic to the secondary ability bar.
Tier 7
Aspect of the Ox - 
Dampen Harm's cooldown is reduced by 
3 seconds for each instance of damage that Taran Zhu receives during it.
Reverberation - 
Tolling Bell's maximum damage scaling is increased to 
300% (for the same distance). Additionally, 
Tolling Bell's second strike applies 
50% of its damage and Stun in a small radius around its target, with the radius increased by the charge distance.
VOID -
VOID -
I'm not sure what exactly you mean by special role, but he's pretty much supposed to be a core tank similar to Muradin or Diablo, with crowd control, durability, and some mobility, but with a unique resource that would give him a distinct play style.