Totems for me. Not really hard. Just time consuming and repetitive
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I don't think any of them are necessarily hard unless you have a bad team for Oryx. I picked Totems because they are more of an annoyance than anything. You have to get it stand there, wait thirty seconds run, come back, wait, rinse and repeat. And you have to do this 10 times. Very repetitive after the third 'wave' and feels like a stop sign with a timer on it.