Neat idea. It'll be interesting to see how this works being fully open. Alexander vs Persia got pretty chaotic and that was just with half a dozen contributors. In the end, it improved the product though.
There's going to be some spoiling for Alexander vs Persia here because there are similar concepts on some of the units.
Flavor & Story
Can I ask what the art theme is going to be? Because that can help with the design. Are these going to be jungle-tribal (a la Brazil) or more true to the traditional amazons and be more "Homeric Greek"? I personally like the Homeric Greek, as thematically it'd let you have a 'society of heroes,' which is not something that could be done historically but fits so well once you introduce fantasy elements. Plus bronze breast plates and horse-hair plumed helmets & other Greco-Roman simply seems kinda cool.
I'll base my suggestions on this theme, pick and choose what you like.
As for background, the Amazons are a heroic society. They aspire to be the best, to be heroes at their role: the best warriors, the greatest poets, the smartest mathematicians, the cleverest merchants, heck the best farmer. They are driven thus because the greatest of their number are ascended to become demigods, and live forever in the halls of the Goddess, becoming muses to their descendants and semi-divine patrons of their society.
The Amazon worship two gods, the Goddess and the Oath-Breaker. The Goddess rules over the hunt, the wild, and the centaurs, and is the patron of the Amazon. Her centaurs taught the first Amazons how to shoot and fight, and they still act as counselors to the Amazon people today.
The Oath-Breaker is a male god of drink, lawlessness, and madness. Every year, the women of non-Amazon society participate in a 5-day ritual of music, drink, and ecstatic dance, led by the priests of the Oath-Breaker. Most women take part in the ritual and then return to their lives, but a few find themselves filled with the ecstatic fervor of the Oath-Breaker. They do not return home, forsaking their bonds to the community to become an Amazon. In this way, the Amazon nation gains new members to supplement the less common births by Amazon women.
(the Oath-Breaker is based on the ancient Greek cult of Dionysus, which basically did have an ecstatic ritual for women; he was also the god of madness, not the 'jolly drunk' we know him as)
So based on this, I can see a couple of different units:
1) Priests of the two gods: one unit for each. The Priests of the Goddess could be Standard and cast spells that help the Amazon units. Bonuses to courage, stats, dice, etc. The Priests of the Oath-Breaker would cast spells that either hinder the enemy (like -1 to stats, change an order to hold, etc) or help Amazons but at a penalty (so maybe +2 dice but -1 Def).
2) Newly arrived Amazons. They're still filled with the ecstatic fury from the ritual of the Oathbreaker. So maybe a Fearless, always on close unit.
3) Different types of centaurs. Not the wild ones of Ravenwood, so not as good with combat. Maybe lighter and faster? Or better defense? Maybe multiple types of centaurs?
Army ability: I'm thinking something that'd represent them striving to be heroes. Maybe call it "Heroes shall Rise." Spend a Command Action on the unit. For that turn it gains one of the following: (+0) +1/+0 or (+0) +0/+1. Perhaps no playing CCs on the unit that turn? This is just spitballing and letting Kevin put up his hands and going "whoa, whoa, whoa!"
Amazon Sword - 192 points - Core
O:(5)5/5 D:2/2 R:- M:L C:12
Hits: 4/3/3
Amazon Spear - 245 points - Core
O:(5)5/5 D:2/2 R:L M:L C:12
Hits: 4/3/3
Spears. Javelins.
Seems fine.
Amazon Light Infantry - 136 points - Core
O:(5)5/4 D:2/1 R:- M:SS C:12
Hits: 3/3/4
What about using the Light Infantry template we developed for Persia & Alexander? So the unit would look like:
O:(4)5/5 D:2*/1 R:- M:SS C:12
Hits: 4/2/2
* +1/+0 vs ranged.
Amazon Archers - 249 points - Core
O:(5)6/5 D:2/2 R:- M:L C:12
Hits: 3/3/2
O (-1)-3/-2 when engaged. (Yes, they're deliberately the best "normal" archers.)
Interesting. I dunno if I'd want to pay for that Def 2/2, but like I said, interesting.
Amazon Horse Archers
Probably something very similar to Wildmen Horse Archers but a bit better. Six skill seems a bit much on horseback. Move LL? 12 Courage?
My thought is go one of two ways:
1) make them skirmishers:
O:(3)5*/4* D:0*/0 R:10.5" M:LS C:11
Hits: 2/2/1
Cavalry, Skirmisher, does not cause impact hits.
Ranged attack is LOS, no Move & Shoot penalty
O (-0)-2/-1 when engaged.
D +2/+0 vs ranged
Note the Def zero is intentional because they will be functionally a 3 when the ranged modifiers for shooting at cavalry skirmishers is taken into account. Could up to Def 1 if you really wanted, but this'd make it very hard to kill them.
2) borrow from Alexander vs Persia:
O:(4)5/5 D:1/1 R:10.5" M:LL C:11
Hits: 2/2/2
Cavalry, Ranged attack is LOS, no Move & Shoot penalty.
When Direct Controlled, treat rear arc as front arc for ranged attack.
(This is close to a copy from Alexander vs Persia, so we'd need some way to make it slightly different).
Mercenary Infantry - 177 points - Standard
O:(5)5/5 D:2/2 R:- M:L C:12
Hits: 3/4/3
Mercenary. Impulsive. No Army Ability.
What about giving them more Yellow boxes. Make them 3/5/2. That way they're mediocre in that they're taking that first check early and losing an attack, but once they pass that one it's going to be a lot of boxes before they take the red check.
Goddess Warriors - 424 points - Elite
O:(6)6/6 D:2/3 R:- M:L C:14
Hits: 5/3/3
M'eh. Standard 'better guys.' Or girls in this case. What about making them demigoddess who've come back to fight beside their descendants? Make them fearless.
O:(5)6/6 D:3/2 R:- M:L C:-
Hits: 4/3/3
Or maybe do both: have a unit of heroes about to ascend and a unit of demigoddess. Or instead of a whole unit of demigoddess, a unit led by a demigoddess. The big thing is that unit becomes fearless.
Mercenary Knights - 386 points - Elite
O:(6)6/6 D:2/3 R:- M: SS C:12
Hits: 3/2/2
Mercenary. No Army Ability. Heavy Cavalry. Impulsive.
M'eh. Okay I guess. I'll be honest the more I think about it, the more I don't know if I like units in a deck that can be taken by other armies. Kinda cheapens that deck. Maybe if the unit gets something when with the Amazons that they don't when with other armies. Maybe a courage bump when within 3.5" of an Amazon unit?
Horse Spirits - 282 points - Standard
O:(6)6/5 D:3/1 R:- M: LS C:12
Hits: 3/3/2
These are NOT cavalry. These are priestesses that can run as fast as horses. Is that awful?
Yeah I'd ditch them.
Priestesses
Before deployment, reveal all Priestesses in your army. You gain Foresight: 1 for each revealed Priestess. After deployment you gain Intelligence: 1 for each Priestess in your army.
I really like this ability. How about the two different priestesses units I suggested:
Priestesses of the Goddess (Standard)
(insert crappy stats here)
You gain Foresight: 1 for each Priestesses of the Goddess. After deployment you gain Intelligence: 1 for each Priestess in your army.
Spells:
Defensive bump: +1/+0 this turn.
Toughness bump: +0/+1 this turn
Blessing of the Goddess: ignores modifiers for being in the Yellow/Red this turn.
Priestesses of the Oath Breaker (Elite)
(insert crappy stats here)
Draw one Command Card for each Priestess of the Oath Breaker.
Spells:
Madness: ranged attack, 10.5" (2) 6/6. If causes a wound, enemy's standing order becomes Hold
Ecstasy: (+2) +0/+0, Def -1/-0 this turn
Mania: reroll failed rout checks this turn
Centaurs - 319 points - Standard or Elite
K, I'm out of ideas for them to be the old advisers.