Putrid Crystalian Trio (Sellia Hideaway Boss Fight) - Elden Ring
FAQ/Details:
Strength and Faith build. Weapon is +5 Watchdog's Staff.
Talismans were the Assassin's Crimson Dagger, Hammer Talisman, and Mottled Necklace.
The RNG of how the Crystalian's target plays a bit of a role here. I needed the summons to reduce aggro.
I used Raya Lucaria Soldiers instead of skeletons because the skeletons cannot tank and they won't res if they get hit in the process. Note that each boss here has multi-hitting attacks that keep going and going. Those skeletons are gonna be mulch. Also the bigger soldier tends to stay in the so they spread out and don't get AOE'd sometimes.
Aspects of the Crucible has a wind-up, but you go low during it, and the spear can sometimes miss you during it. During the rush, you are not invulnerable but you won't be stopped (see my first rush on the Staff user)
Why did I go for the Spear guy first? He's the closest. If I went for the staff guy first I might get interrupted on both sides. The spear guy also approaches the fastest. Then, once you're in the fray, the AI in your summons should hopefully kick in and have picked targets to draw aggro from.
This should be obvious from messages on the ground, but you need to use striking weapons. Charged attacks and jumping attacks hurt good, and that's why I have the stamina damage talisman on. Once you've broken them once, they have no Poise and get interrupted all the time. Heck, even the summons can interrupt them.
Assassin's Crimson Dagger talisman can heal you whenever you get a crit stab. This can counteract chip damage and scarlet rot.
Additional Tip: I also have Rejection equipped, but I didn't use it. Rejection does no damage, but is fast cast and low cost. It will also knock any of them onto the floor. With some clever rolling, you can knock them onto the floor to buy yourself a brief respite. Use strategically.
Most importantly, don't get boxed in while your minions live. Make the most of their time. Get the bosses to split aggro, and try to end up in a 1v1, and then take them down asap. Spam the Horns incantation if you have to. If you can reduce it to two enemies, the fight becomes like twice more manageable. Bonus points if you still have minions alive and kicking.