Evolve Stage 2 Bloodrock Behemoth counters Slim at Relay.
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Behemoth Perk : Brawler, Cooldown, Cooldown (as suggested by TRS devs in stream before the update went live)
I had hard time breaking slim hank even in cave .. you need a perfect wall at the right time to break them.. they did a good job in cave dome .. The key to breaking slim is hit and hide .. Slim cant heal if he cant shoot .. unless there are wildlife.. the relay fight in the end is a good example of how you can turn the tide ..