Okay I've had a think
I decided to give feedback on the Fell Abilities rather than the Adversaries themselves. I prefer to construct my monsters by having a solid list of Fell Abilities which can be added/subtracted/swapped.
Bloodlust: Each successful attack made by or against this creature restores 1 Hate.
(Like this one, pretty powerful but makes a nice Boss ability)
Berserk: May spend 1 Hate to ignore the Weary condition this round. This creature will never willingly flee or disengage unless ordered by its master, and is unaffected by the Intimidate Foe task unless a Magical success is obtained.
Relentless: When an attack reduces this creature to 0 Endurance, it triggers a Piercing Blow. Then, if alive, it regains 1 Endurance.
(I think these two could be combined into one Ability. Something like:)
Berserk Fury: May spend 1 Hate per round to continue fighting even if Wounded or reduced to 0 Endurance as long as he has Hate to spend. In addition this creature will never willingly flee or disengage and is unaffected by the Intimidate Foe task unless a Magical Success is obtained.
Onslaught: May spend 7 Hate to strike first this close-quarters combat round, unless Ambushed. Additionally, all attacks made by or against this creature have 1d bonus Success die this round, and its first attack roll is Favoured.
(Don’t really like this one. Did you mean 7 Hate?
I’d perhaps change it to:)
Onslaught: May Spend 1 Hate to gain (2d) and make the attack roll Favoured. All attacks made against this creature gain (1d).
(A more powerful version of Fierce Folk, with a trade off)
Keen-eyed: May perform the Prepared Shot Combat Task (Scan rank of 2, TN 16.)
(I’m not keen - no pun intended - on this one: More dice rolling for the LM, Just change it to.)
Keen-eyed: Spend 1 Hate to gain (1d) on their ranged attack rolls.
Barbed Arrows: If the creature scored a Piercing Blow with a ranged attack, spend 1 Hate to make the target's Protection role Ill-favoured.
(This is a renaming of Sure Shot, I like the idea of Barbed Arrows though, maybe a ranged only version of Deadly Wound would fit better.)
Crack the Whip: Spend 1 Hate to restore 1 Hate to all other Orcs (not Uruks) in the fight.
(I like this one, nice alternative to Yell of Triumph.
Shadow-malice: Black Uruks have Hatred for Men, Elves, and Dwarves.
(I like this one, was unsure at first (seems powerful for rank and file adversaries) But actually makes a good distinction for Uruks over orcs.)
On the subject of Uruks, they need an ability to cancel/modify the all orcs hate sunlight. Still thinking on that one.
Bellow of Triumph: Spend 2 Hate to restore 2 Hate to all other allies in the fight.
(I like this one).
Dreadful Roar: Spend 1 Hate to make all Player-heroes in earshot gain 2 Shadow points (Dread). Those who fail are stricken with unease, and cannot spend Hope until the end of the next round.
(I like this one. nice lesser version of Strike Fear.)
Will of Lugburz: This creature is not affected by the Intimidate Foe task, even if a Magical success is obtained.
(Think I’d change that to only if a Magical success is obtained.)
The Eye Watches: Olog-hai do not have the Dull-Witted Fell Ability and are unaffected by the Weary condition. Each successful attack made by this creature restores 1 Hate to all allies in sight. If this creature dies, all allies in sight lose (d6) Hate.
(Nice, this one is very thematic. I would consider breaking it into two though. First part for all Olog-hai and the second part as a new trait for some kind of Olog Warlord.)
Overall good stuff, nice to see someone else making new Adversaries. I'm still working on my stuff - lots to do.