That's because precision arrows primarily give you range, they don't really do that much more damage than normal arrows. If you want raw damage you have to use triple shot heavy arrows. And he really is super easy to take down. You are using the wrong arrows and equipment. Ropecaster works on it but you have to use more ropes, unless you have a purple ropecaster in which case you need about 2-3 ropes. The rope down time shortens if you hit an enemy so many that's what's happening with you. Ropes should really be used to give yourself a window of opportunity to lay traps and get a safe distance.
The three easiest way to take him down:
1) 1 tear arrow to disc launcher, it disengages the disc launcher. Pick it up and you can essentially burn him down from full health to zero health just using disc launcher.
2) Bring him down using ropecaster, put fire debuff on...repeat. It's weak to fire and takes massive damage.
3) Set blast and fire traps/tripwires pre engagement. A few of those he'll be down to half health in a second. When he is recovering bring him down again with ropecaster and lay new traps. Repeat.
If you use strategy 1 then you could probably kill him in 20 seconds without even being touched. No matter the difficulty or level.
Wowww. I've been doing it wrong all along.
I went back to fight it, a little bit after my last post for a 2nd go and he just wrecked me left right and center. I placed Blast Traps and Fire Exploding Traps this time around to mix it up and it did so little to.
I thought he was the hardest enemy to take down after my attempts but after reading some posts here on how to take it down, I am legit shook lol.
My Ropecaster color is still green, I ahevn't found any upgrades for it as I'm still pretty much early in the game, and have not unlocked the perk that allows you to fire 3 arrows yet. Nor do I have these tear/heavy arrows that you mentioned? Just pierce arrows (if thats what you mean ?)
All I did was keep using the Focus to highlight the weakest parts and keept going in for that, but I realised that I'm too under-equipped for it. To top it off, I easily wasted all my resources fighting him, so its as risk at the moment for me to engage him. I'll need to grab a better Ropecaster, get that 3 arrows perk and upgrade the Trap quantity in order to stand a chance against that beast.
It boggles my mind how you guys find these methods to easily take it down. He is no joke.