Hi, thank you for playing Sipho! Which boss was it specifically? It might not be balanced enough as of now to allow any combination of zooids to achieve Utilitarian achievement. We would like to improve that and provide different ways of killing bosses without using weapons directly.

The last boss, i forgot the name of him. I found only one person who cleared the last boss, there was a video on youtube, but when he cleared it, he didn't have the adds spawn and the boss instead of a ball was in a sausage form, not sure if the boss have been reworked or what. There is some major difference. When he cleared it the boss spawned in a long sausage formation and adds didn't spawn and the central head part wasn't so protected and surrounded with so any healing pods, so he could chip away on it from the side and it could out damage the healing. Now the boss have adds, they don't cause any problem, but when the adds stop the boss spawns in a ball form and has so many healing pods that you cant really out damage it, also it doesn't run out of energy, i was spamming this one sweet spot where he could not touch me for some 10 minutes straight with five squirters and two sizzlers, i was far away that he could not hit me, but it didn't work. Afterwards i went in closer so he uses sizzlers on me, was trying to drain its energy, but even if it uses sizzlers and healing non stop it never runs out of energy. I also was in a sweet spot where he could not electrocute me, so i had a constant stream of five squirters and two sizzlers and the damage is just not enough.
I am not complaining because the achievement is hard, it just unbalanced, because i killed the boss with a single claw and later on with a single pike, but when you make a grand mother ship with all the poisons in the world you just cant deal enough damage.
So i assume that anyone who has that achievement got it before the boss rework.

Some bosses have been reworked since the game has released, so it might be the same boss that's different now. Could you share the video?

Indeed, the achievement is supposed to be hard and sometimes impossible with zooid loadout you choose during the run. However, some bosses, except for the final one, can be avoided by choosing which areas to dive to - each level after boss level spawns two types of whirlpools which lead to different areas and eventually lets you fight different bosses - something you could optimize for utility run.

To note, the Cra'Than breed is specifically designed to counter poison by the use of healing - which might be beneficial to fight and defeat early so you don't have to clear their area later or. Or fully skip it - there are 4 breeds and only breed-based 3 bossfights - with final one being always the same.

Also, some boss fights are going to be improved and some redesigned, especially the final boss fight. Please, if you can share which fights have been unnecessarily hard to beat with Poison run, maybe I could add more interesting alternative strategies to beat those bosses.

Thank you for taking your time to talk about Sipho!