Appearently finding and fixing the bugs in bitesized portions today:

Found the barracks to be broken and fixed them so the ai can recruit all the base units. And doesn't get confused recruiting nothing sometimes.

Hotfixed Sentries being disembodied weaponless torsos that summon throwing axes from the dark of their soul and hit their enemies with very deadly air in melee.

Anyways, Sentries have legs and weapons again.

Another rather small patch:

Fixed audio bugs of various units.
Gave scouts a better unit card.
The a.i. is now able to recruit RoR's in quick battle if you autogen an army.

Fixed an accustic error when commanding several obsidian legion units at the same time.

Fixed missing leg texture for the Legion Vanguard.

Added the first 4 RoR's.
The Obsidion Legion Commander has received a new shield texture since the old one was ugly.
Fixed a few errors/inconsistencies in the unit describtion, ability describtion and unit names.

Balancing changes:
Reduced the morale of almost all melee units (including Obsidian Legionnaires) since it was ridiculously high on average (making a lot of them quasi unbreakable).
Reduced the range of Heavy Thunderers to 145. Not only was the 160 range too good for the cost, it also gives you more of a reason to use scouts who retain the larger range.
Removed Immune to Psychology from Legion Bulwarks. A minor nerf, more akin to a cleanup. They already have frenzy, so as long as it is active they are Immune to Psychology anyways.

Fixed an incompatibility with my own 'Trolls for the Trollking' mod.

Special thanks to Mr spaghetti for not only finding the bug but also the solution to it.