1st boss
After each spread phase the boss gains a stack and gains extra damage by it, so the only way for me to survive was if lurvi aggroswitched with me and used grounding. Reason you cant see any trees or healing bears is cause his healrating was low, so he used reset on bigheal cooldown, only to gain an extra 10% poision invul buff for 24 seconds instead of 12 . If you last to the end, theres a teaser for a video coming soon moaha.
https://www.youtube.com/watch?v=Jxe85e77Wj8
2nd boss
https://www.youtube.com/watch?v=FGxuagIK2bY
Since 2nd boss is easier due to kiting potential and less damage output from his normal attacks, we decided to spice it up by eating every seeing red doing nothing to decrease it stacks, and build ourselfes in, in the centre with rocks around us.