It takes around 20s of global cooldowns to go from 0 to 5 Wrath stacks. However both Vengeance and Berserk add Wrath stacks, meaning that 20s Unchained countdown can be cut short enough to get an Inner Beast off with Unchained Still up.
You can also do this, though it depends on your MTs aggro.
– Keep Defiance on from the start (watch your aggro)
– Work up to 5 Wrath the old fashioned Way
– When the tank has sufficient aggro, blow Unchained
– Berserk + Internal Release + Vengeance
– Get to 5 stacks with 3x Combo
– Inner Beast
– Infuriate
– Inner Beast
