Valheim Fader Strategy

Cave probably isn't necessary, you can probably create a little circle of raised ground completely using stone. It's just nice to be able to dip into the cave if you need to. I didn't have the fire lit here in the cave which could have sped this up a bit. Good strategy for speedruns since Staff of the Wild isn't too costly, and eitr is required anyways for Mistlands.
Drop some eitr in the middle of the raised ground (I dropped 20 here), bait him in the middle, climb out, and trap him in. I technically was out of range of the workbench under the cave entrance (was able to raise ground with devcommands) but another couple can be placed to ensure you're in range.
Staff of the wild + eitr will finish him off pretty fast. Even in this attempt, I didn't have him sitting on the eitr very well for some of the fight, so this could be even faster. Not entirely sure why sometimes he just sits there and doesn't even attack the vines. It can be manipulated for him to never attack once he's stuck but it's a little unreliable. Still a 9 minute kill here :)

[@Archy2Cold]

Nice strat :)