There are 4 main ending branches, but several permutations for how you can get there and what happens from there. Plus an early death scene and the hidden Williams ending.
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The DC branch (get captured after the battle). Includes 2 main endings. From here, werewolves who are particularly violent (or human-hating) will be likely to get chosen by General Rivera. Other wolves will be removed and sent to the basement cell with Williams. You get to DC by not making close friends of the activists, not being overly liked by the military, and having low to moderate public sentiment.
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Sonoma’s camp. There are 2 main endings here. Trust her or don’t trust her. Get a chance at this by having high activist rep OR high public rep, OR high human military rep. None of these are a guarantee, but they give you a good shot.
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Retire to a cabin. This has 2 slightly different endings too. Join Rivera or stay in solitude. This ending may be reached by getting the Sonoma’s camp ending and refusing to fight, OR by befriending the military to a moderate degree, getting the sequence where they betray Williams, and choosing to leave with them when they offer you a ride to safety. (This is tough to get on purpose. If you want to get the cabin ending, I suggest going the Sonoma route.)
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Escape with the activists to Anna’s father’s mansion. This ending is ONLY achievable with a very high activist rep, and by staying with them after they break in to save you.
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If you fail the two fighting checks when battling Williams, Razor will jump in to help you. If you decide NOT to run, but instead to defend her against Williams AND your pack did poorly in the fighting beforehand, you will likely die here.
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Join Williams. Getting this ‘secret ending’ path is complicated and happens in chapter 11. You must either FAIL your stat check to escape from the decontamination room where you are reverted to human form OR pass the check then decide to question Williams, but this will only work if you made no delays escaping during chapter 10, otherwise Williams’ soldiers will come too soon for you to question him. You must then have a neutral or higher reputation with the human military AND be less than 50% feral to open up the secondary line of discussion. From here, you will see choices beginning with “So you believe that your extreme measures are justified?” You must then side with Williams and NOT call him a traitor. This will switch your ending companion to “Elan”, open up a good deal of alt dialogue, and unlock an ending where you fight against Haken and leave Haven as dear ole’ dad’s protege. (Side note, the human army rep check for this is set at 25. ‘Disliked’ is 19 and lower, and ‘Neutral’ is 29 and lower.)