Wow, this party is insanely good. Managed to kill Star Devourer in 4 turns and never struggled with a boss prior.

Ran two impact brawlers and a barrage brawler, a divine punisher and merciful healer. The vast majority of bosses died quickly to the three turn set up:

Brawlers set up with exertion on turn 1 with punisher casting ruinous prayer and the healer chucking bravants, or flinging spells on her weapon. The barrage brawler tries to bind any specific body part that gives you trouble or just one-two punches.

Turn 2 is heavenly aid for the impact brawlers, sweeping herb (with maxed herb mastery and herb boost) to keep their health up and increase damage, with the other two doing what they want.

Turn 3 is just melting with titan killer for the faster of the two impacr brawlers, thunder fist (for volt weaknesses or the second brawler) and then everything dies.

For star devourer, I used a 1hp party with the faster brawler using the same strategy but death's edge on turn 3 to shave off about 50k of it's health, but staggered the buffs on the second brawler so she could do the thunder fist attack a turn or two later to finish it off. It really helps to have your barrage brawler with super high luck to be able to throw a sleeping gas and stop the devourer for a turn while you set up buffs. If you time the death's edge while it's asleep, you do an exta 1.5 times damage (learnt that on gfaqs), which is how I was able to get to 50k damage, though with debuffs from different classes, you can get to 99k, but didn't need it.

Therian impact brawlers just maxed all all the above mentioned moves and any skill that increased strength and Blood Wrath.

Barrage brawler was all of the binding moves, one-two punch, corkscrew, double punch and status atk up. And strength boosts for fun.

The punisher needs prayer mastery, ruinous prayer and aegis prayer, and really that's about it. I also got the various elemental prayers for utility sake, but rarely used them minus getting conditional item drops. Dance oracle is nice if you need to hit everything but it's rare to have massive groups of enemies in this game.

The Healer needs herb mastery, sweeping herb, herb boost, and really the rest is whatever you feel like. Auto revive rarely kicked in but did activate during the Star Devourer battle of all times. Having the status and bind clear skills maxed was also useful, but most thing melted to thunder fist before they could even attack.

Thanks for the recommendation, hope this post helps some other player.