Good job. I disagree with one of the answers, but that's fine. I'm not a T.O. and it makes the force I would play a lot more powerful as a result.
There are two typos on page 24.
The heralds Q&As are missing the "A." part of their anwers. This is actually a formatting issue rather than a typo.
The last question uses "form" when it should use the word "from".
Lastly:
Can Druzhag's Enrage Beast spell and Special Rules affect wargs that being ridden (AKA warg riders).
Enrage Beast [WD 352 - page 47]:
"This power can be used against a single Bat, Warrg or Spider model. If the power is successfully used, the target becomes enraged - its Fight, Strength, Attacks and Courage are increased by 3 until the end of the fight phase. The enraged model suffers a Strength 10 hit at the end of the Fight phase, to represent the severe exhaustion brought on by its efforts."
Courage Tests [Rulebook page 34]:
"In the case of mounted warriors only the rider needs to test - mounts do not need to make a Courage test so long as they have a rider."
Cavalry [Rulebook page 48]:
"We refer to all mounted models as cavalry. Cavalry are usually mounted on horses, but Warg Riders are also cavalry."
Cavalry & fights [Rulebook page 50]:
"...the rider can always use the Fight, Strength and/or Attack characteristics of the mount instead of his own..."
Warg Riders (or in my case Orc Trackers) ride wargs. Druzhag's spells affect wargs. So by extension the mounts are affected by his spells. No rules issue here.
If I cast the spell on a warg ridden by an orc. The Warg becomes FV 6, Str 7, A 4 and Courage 5. On a charge the cavalry model will get an additional attack and will potentially do double strikes. Still no issue as far as I'm concerned.
The warg's boosted courage is of no consequence as the ridden warg will never use its courage value. So no issue with the warg's higher courage value.
Where things potentially start to get sticky is as follows:
The Enraged Beast spell states "the enraged model suffers a Strength 10 hit at the end of the Fight phase" and cavalry are considered to be single models. So does that Strength 10 hit apply to the mount (warg) part of the model or can it be applies to either part of the model? My personal thought is that only the mount (warg) part of the cavalry model takes the hit as only the warg is affected by the spell. If the warg dies then the rider is thrown as normal of course.
A warg's courage value is equal to 2 or to Druzhag's courage (4) if it is within 12" of him. If under the enraged beast spell and within 12" of Druzhag does the warg have a courage of 5 or 7? The spell says the models courage is increased by 3, Druzhag's special rules states that all wargs use his Courage when within 12" instead of their own. I can go either way on this, though is sounds like you increase the Courage of 4 (Druzhag's courage) by three when under the effects of the spell. Which would make the enraged Warg a 7 Courage. Very useful when trying to charge terror causing critters (especially wraiths) with a warg.