lets make patch notes: warriors

I think Chaac is balanced due to the fact that he has a hard time getting kills. Is he tanky? Yes. Can he deal a LOT of damage safely? Yes. Can he turn around teamfights? Yes. Can he get kills/get fed? Nope, not unless your team tries to feed you.

Since he has a really hard time getting fed, it keeps his tankiness/damage at okay levels.

chhac is a very hard solo to counter and because of skills 1 and 2 he is more ranged than melee. Skill 3 together with basic attacks makes him a bit unbalanced. They must reduce the range of his axe from skill 1. Make him more melee than so much ranged.

I just think his ultimate shouldn't make him invincible. It's already Aegis, I think Chaac could handle a downgrade to Purification Beads.

ya that would do, nerf his ulti

Chaac is all about AOE damage, if you took away the invincibility, he can't really take those risks anymore, vastly reducing his overall DPS and/or survivability. Maybe if you reduced damage by 50% or at least 25%. If you were to take away his invincibility fully, maybe at least reduce the charge up time and add a bit more extra damage. Chacc players heavily rely on that invincibility save their ***es. If you took that away, Chacc would lose out on too much. If you really want to nerf him, increase his mana costs by like 30. Make him use his passive :P

Those are some excellent points you have made.

Adding to this, what makes him slightly overpowered IMO is his abilities to combine basic attacks with rain dance. Also, mana sustain from passive and maxing out his axe and rain dance make him formidable early game. He's not that strong late game in team fights though.

No. No. No

Chaac does not need an invincibility, especially not on his ultimate.

Why? He's already stupidly durable when he's built like you're supposed to build him (with some degree of tankiness) because of how much regeneration he gets from his Rain Dance. A regen buff that also slows movement and attack speed of enemies around him (or his axe) by 25%. It's like he's got free Frostbound Hammer and Witch Stone rolled into one move!

There's also the fact that Storm Call is very effective at locking down opponents. Unlike say, Ares' No Escape, Chaac doesn't move slower when he's charging up his ult. And when he catches you in it, you become silenced for a whole three seconds, regardless of it's rank.

Think about that for a moment, just how many gods are rendered completely helpless in three seconds of silence. Mages are completely disarmed with the exception of those basic attackers like Freya, but if their steroids aren't up, they're screwed. Assassins and hunters lose their escapes and become very easy targets. Only tanks aren't really bothered too much, but even a tank will feel useless when it's unable to throw around CC to stop the enemy team from massacring your friends.

Even without that invincibility, Chaac is still a solid god. I'm fine with his ultimate granting him CC-immunity, but there is no way in hell he should be completely safe while channeling it in a world where Ares is a free target as he's waiting for his ultimate to fail against a team full of beads and CC immunity.

I don't see how Chaac's ult is like Wukong's. Wukong's is about distraction and self healing, Chaac's is about mass AoE CC silence. And no, chaac already has insane sustain. Do not underestimate Rain Dance. Late game it can out-heal Ao Kuang's tornadoes. I think it's fair to give him 30/35/40/45/50 damage reduction for his ult and keep the CC immunity. That's about it for chaac in my eyes.

You said "Do not underestimate Rain Dance". Then you go on to nerf his ult. What I feel.
If you think his heal is op, then nerf his heal!
If you think he has insane sustain, NERF HIS MANA COSTS THEN (or at least his heal/damage)! Your scaling for the damage reduction is absurd. 30% damage reduction is basically Loki using his cloak (not much of a damage reduction). At least give the man 50% damage reduction consistent within levels. The removal of his invincibility is already such a big nerf.
Funny thing is, Chacc's ult is not his most over-powered ability (in his kit). His damage on his 1 is really powerful early-mid game. Chacc's heal is really powerful too. After hearing that you put on a face and say in the most monotone of voices:" Oh gee, his one and 3 are really op and his invincibility on his ult is just the icing on the cake of op-ness... Lets nerf his ult!"
I think the word is contradictory. Anyway, please look outside the box, the box is see-through so you should have no trouble finding other faults about Chacc.