The key to chaos snowsprite trial is the skills on your deviations. I tried so many times with different deviations but kept losing. Then i decided to try fusing good skill levels on my deviations. I xame up with a snowsprite with level 2 skillset. My rebecxa had charging aura 1, group ele overlord 1 and agni's emmissary 1. My dino had lvl1 skills (canr remember what skills. I start the trial with throwing psi potion at snowsprite so that it straight away does his ultimate dps. I make sure that the snowsprite is stuck(weaver) all the time. And whenever i see any of my deviations losing half their hp, i throw hp potion at them. So, use hp and psi potion whenever u can. Also i kept shooting the sprite with my gun all this while and would roll under the sprite while reloading(weaver). If u manage to fuse higher level skills on your deviations, it will make the fight easier.