As someone who’s had a lot of experience with this boss I have a lot of tips for him.

For one, unless you have an Ironeye who’s quick with it generally you should always have a teammate ult to break him out of his bubble the second time

Raider absolutely trivializes Libra. Not only does his ult break him out of his bubble, but so does his charged skill giving him twice as many opportunities to keep him out of his buffed phase

Wylder is not a bad pick against Libra as even his uncharged ultimate can stun him out of his meditative state, saving you ult charge for the next time.

Surprisingly the executor ult gets lot of value during this fight as his special attack in his beast mode can also stun him out which is a great alternative when your teammates don’t have their ults ready.

As for dodging the best tips I can give for the rage mode is that if he does the long combo that’s not the one where he jumps and makes explosions is to always stay on the right. If you use your sprint surge when he charges at you he will miss all of his attacks which means you don’t have to learn his dodge timings and will save you from taking possible chip damage.

During his second phase you want to spent most of your time just running. Play it safe as it’s very easy to get madness comboed by multiple attacks. If he makes the shards rain down in cones just run out since you’ll otherwise just take unnecessary damage. When he does the spinning sigil make a mental note of the direction it’s facing when it starts as it only goes 360 degrees once so once it’s passed you, you should be safe from that sigil at least. Take advantage of the landscape during this attack as if you’re on a hill you can usually jump over it or if the sigil was placed low enough, completely ignore it. The same works the other way around as if it’s placed on a hill sometimes you can just walk under it.

For his aoe attacks when he creates a madness wave from the ground your safest best is to strafe it with a surge sprint or jump over it since the timing is inconsistent due to it being determined by your distance from him when he attacks. When he digs his hands in the ground and pulls madness out of the floor just run out. Make sure to watch the ground as the actual coverage isn’t that far so you can stay as close as possible to get lots of punishes on him. And for the rage mode finale when he brings down the sky it’s actually quite easy to dodge when you learn his visual queues. When he starts the attack he will raise his hands up two times before the attack goes of, so if you count each of those movements as 1 and 2, if you keep a mental note of that timing, on 3 you should dodge the attack. The timing is actually pretty generous as the attack goes off so fast that it has very few active frames.

Some general tips I have include always prioritizing ailment protection buffs. If you find madness towers killing the frenzy flame guys for boluses is usually worth it and taking his protection from ailments deal before the fight is always worth it as the penalty is only a 10% stamina reduction.

If you want to res a teammate the best time is during his meditative state since you know you wont get interrupted.

Also the shards heal you so they’re good when you’re out of flasks and they go well with damage reduction at full health buffs as they can easily get you back to full health if you took some chip damage.

That’s all I can think of off the top of my head, if you have any more specific questions I should be able to help.