Hi thought I’d share my strategy on how I beat the first encounter with the Warden Eternal in case anyone else gets stuck at him going for the Lone Wolf achievement. It can be pretty hard because you are dealing with 3 AIs and you are the only human on a very small map.
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Before the battle: Make sure you pick up the incineration cannon from the battle with the knights before the Warden battle. DMRs and suppressor rifles won’t be able to burst him down enough.
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At the start kill the 5 crawlers that spawn, and tell your team to stay at the spawn at the very back. Immediately run up one of the ramps on the left or right to the very top so that you are behind him and can shoot down. Charge up the incineration cannon and empty it into his back until you’re out. He will not fire at you because he’s summoning soldiers and the crawlers.
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Next, drop down to one of the walkways on the very left or right of the map. I chose the right because a scattershot spawns there if I’m not mistaken at the time of writing this. From here the Warden will not run up to you and he cannot snipe you with his face sniper. You can kill the soldiers that spawn through the “doorway” at the end of the walkway with 3 scattershots. If any teleport on you throw a promethean grenade at their feet.
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To damage the warden tell your team to go the start of the walkway (near the spawn) and then (up on the dpad) shoot the Warden. Then, you are able to jump up through the doorway at the end of the walkway and hit him in the back.
Good luck, if you’ve also beaten it post any other tips.