REX: Dunked

 is a challenge in Risk of Rain 2. It is completed as by killing a  on Abandoned Aqueduct by throwing it into a pit.

Tips

 * The hardest part of this challenge is to get a to spawn near a pit on Abandoned Aqueduct. Once you've found one, shoot at it to get its attention and stand far enough away from it so that it'll start (slowly) chasing you. Stand on the opposite side of a pit to force it to go along its border. Once it is close enough to the hole, go behind it and boop it to its death with.
 * It may be easier to do on a longer run, where a may spawn naturally in the environment, making it less of a hassle to find the opportunity.