Different builds for clash:
Attributes:
Either full int or around 30-50 points on str for the extra hp and rest on int

Fire/Curse

Skills:
Fire(5/5), curse(5/5), heal(5/5), shield(5/5)

Masteries:
Shield(10/10), heal(10/10, fire(10/10), curse(10/10

Passives:
Knowledge(5/5), dmg(5/5), might(5/5)

Wind/Curse

Skills:
Wind(4/5), curse(5/5), heal(5/5), shield(5/5)

Masteries:
Shield(10/10), wind(10/10), heal(10/10), curse(10/10)

Passives:
Knowledge(5/5), dmg(5/5), might(5/5)

Note:
Don’t use the speed upgrade on wind, as for the pushback on shield I find it useful as it pushes the lead back and opens up the dps.

Other than that just gotta work on sense play and timing

Khan already noted that gale doesn’t stun while the other team are under the rally cry buff but it’s still a good skill to use...there’s always the charged basic stun. 12secs of the buff should be up and you got them open for stuns.