Actually you can Solo this Raid and beat it, without cheese.
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If you are a hunter. :)
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Not after the 13th. The bridge gatekeeper will be impossible with 1 person
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No, still possible, just more difficult
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Extremely difficult because of the small time frame you have to kill the gatekeeper and ogres before you get exploded by the totems. Definitely going to need gjallarhorn
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Once the Bridge is up you have enough time to step off, kill the keeper, and run up. Raid boots help a lot in that respect, and a good Rocket Launcher will do the trick, but you can also keep ticking away his health, just make sure you keep regular hits on the keeper so he doesn't regenerate his health.