can not kill this boss
You damage him via the grubs. Lure him on top of a group of grubs, kill the grubs, and as they die, they’ll damage the boss.
Yup, what Stitch said. The grubs damage the boss when they die. So, don’t kill the groups of grubs unless the boss is next to you/the grubs.
ty all for the help an the tips an it is nice to be able to use the thawing potion also when doing this! now just have to finish up other achievement for the map xd