I've reworked them a bit and now think they fit the requirements a lot better and have a better feel:

The Unfallen: Nearly-Immortal, Dual-Natured Sentient Trees that CANNOT DECLARE WAR WHILE PACIFISTS ARE IN CONTROL OF THE SENATE.

Pascifist Diplomats

"Speak Softly, but Carry a Big Stick."

Faction-Specific Traits (Changes in Green!):

War and Peace from the Senate: The Unfallen cannot declare war while the Pacifists are in control of the senate. As they're peaceful by nature, they also receive a 20% malus to happiness when they declare war with anyone else in control of the senate, except Militarists. With Militarists in control of the senate, they can declare war freely and receive no malus to their happiness.

Smoking the Trees:: The Unfallen can force peace by sacrificing a population unit, as their smoke is intoxicating and has an extreme pacification effect. This truce lasts twice as long as a normal truce as the effect of the smoke is addictive, too. This sacrifice is highly regarded as one of the most noble things an Unfallen can do.

Living Dwellings:: The Unfallen use food as their production, as they use their own to construct their infrastructure. Therefore, Industry is not utilized.

From One, Cosmic Power:: They use their own to build monstrous  ships, which require populations points to build. As such, some of the larger hulls are available a bit earlier, too. They also regenerate over time, without the need for technology.

They're In The Trees!:: As The Unfallen share an affinity with all plant life, plant life on other faction's planets give The Unfallen some non-detailed information once they've become aware of The Unfallen's existence. Build queue, population and stationed ships are known to The Unfallen.

Peace Provides Sentience:: Being at peace with the Unfallen provides you with one Unfallen population point at every planet you have with a temperate environment, once each planet has room. As a race achieves peace with the Unfallen, the Unfallen enlighten the native tree population. Each Unfallen population unit receives a bonus to food production.

Be sure to vote (and please consider The Unfallen!!): https://www.games2gether.com/endless-space-2/votes/109-faction-creation-contest-design-phase-voting-time

I don't think the changes dramatically change the feel or desired intent, so I don't see why it'd be an issue. It just helps flesh them out a bit and incorporate the "pacifist diplomat" requirement a bit more. 

I've change it to twice as long. I feel like if you're sacrificing an entire population unit, you should see a better truce than the normal one. However, the cost could go up as the game progresses, depending on the population count of the aggressor faction. 

Smoking the Trees sounds super OP for that sort of cost, but since I haven't been able to see any of ES 2s actual gameplay stats, like pop growth and cap, it would be a Dev thing to balance this sort of mechanic.

But from what I know of ES 1, that would be super op there.

Digitalhawk96 wrote:

Smoking the Trees sounds super OP for that sort of cost, but since I haven't been able to see any of ES 2s actual gameplay stats, like pop growth and cap, it would be a Dev thing to balance this sort of mechanic.

But from what I know of ES 1, that would be super op there.

I agree, I Imagine you would need to  sacrifice pop based on how much pop the other player has or something. Unfallen is a food heavy race, so having to sacrifice more population wouldn't be too detrimental. Just saying it sounds OP as it stands in the post

EDIT: Not to mention what I have learned in my contract law class, You already made your offer, and amplitude accepted the terms as was, when they started the vote. I would assume any changes would not be binding.