So... do Special Abilities stack?

[Valarian]

If they run out of Hate, the adversary becomes weary. Then it's in the same boat as a weary player character, with rolls of 1 to 3 on the d6 becoming zero.

What's the significance in that to the question about using multiple abilities in one round? Creatures can use even their last point of Hate to activate an ability.

They can, and then they become weary. They can spend all their Hate in one big go, if they have enough abilities powered by it. But then they are weary. I was just reminding the OP of the consequence to the adversary of spending all their Hate points.

[Elmoth]

A no-hate dude can be make to cower with your forward stance, right? if this is the case, making a troll flee in shame with a forward hobbit can be great

[Valarian]

You can reduce an Adversary's Hate with the Intimidate Foe, bit they won't flee unless Craven.