A little rain never hurt anybody - In depth Chaac guide from a Chaac main

Chaac is a very safe pick. While not excelling in any specific category, he does do average in mostly everything. He prospers while with his team but can still hold his own in most 1v1 scenarios. He has one of the highest sustains out of the warrior class.

Pros:
~ Almost unbeatable sustain
~ Decent damage potential
~ Decent tank potential
~ Amazing debuff potential with rain dance and ultimate

Cons:
~ Can only really do poke damage, no real consistency
~ Long ability cooldowns
~ Often have to choose between healing or dashing during fights
~ Struggles against enemies who have physical protections

Passive: Overflow
When Chaac successfully hits 5 basic attacks his next ability casts is free of mana cost and has a reduced 2 second cooldown. This 5 basic attack passive can build off of enemy gods, player-made structures (Odin ult/Cabrakan ult), enemy wards, minions, jungle creeps, and even interactables around the map such as the solo lane tiki mask. Try to make an effort to get in basic attacks hits whenever possible! This passive is insanely good early game and the CDR still decent going into the late game
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1: Thunder Strike
Chaac throws his axe forward damaging all enemies within its landing radius.
(Note: this damage is static, it will not be less for an enemy on the edge of the axe)
(Note 2: This ability has an arch and is not an instant hit, the closer you are to an enemy, the less likely they are to be able dodge it)
Damage: 80/140/200/260/320 (+70% of physical power)
Cooldown: 10s
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2: Torrent
Chaac spins around his axe damaging all gods within a small radius. He gains 2 stacks of protection for each god hit. If his axe is still lying on the ground from his 1 ability, he will instantly dash to its location doing 50% damage to each enemy he passes through and full damage to any god within the dash landing radius.
(Note: This ability CAN pass through walls making it an excellent getaway)
(Note 2: If rain dance is activated after thunder strike but before torrent, the original axe location will create rain and not be available to dash to)
Damage: 100/150/200/250/300 (+70% of physical power)
Protection: 4/8/12/16/20 (max 5) - Protections last 6s
Cooldown: 13/12/11/10/9s
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3: Rain Dance
Chaac summons a rainstorm for 6s during which he slowly regains health. Enemies caught in the rain will have movement and attack speed reduced for the duration. If he has his axe from thunder strike still on the ground, it will also summon a rainstorm at its location. (be aware this will replace the axe disabling a potential dash from torrent)
(Note: This ability stacks on top of itself, doubling the debuff on enemies if they're caught in your rain and the axe rain at the same time)
Movement Slow: 20/25/30/35/40%
Attack Speed Reduction: 5/10/15/20/25%
Healing 10/15/20/25/30 (+15% of Physical Power) every 0.5s
Cooldown: 16s
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4: Storm Call
Channelled ability in which Chaac after 1s, will unleash a blast around himself silencing and knocking up any enemy caught in its radius. Chaac gains damage mitigation and crowd control immunity while channelling storm call.
(Note: Storm Call will also knock up and damage any jungle creep or enemy minion caught in its radius; this will aggro fire giant, gold fury, and apophis if they are within the damage radius)
Damage: 250/300/350/400/450 (+120% of Physical Power)
Silence: 3s
Damage Mitigation: 50/55/60/65/70%
Cooldown: 75s

Conquest:
Depending on your lane opponent, start yourself with shoguns or berserkers. This is incredibly important as it will grant you the protection you need while giving the attack speed to proc your passive. Early conquest you want to prioritize lane clearing before boxing, use your axe to hit the minions, then basic the archers until your passive procs then rain dance, keep hitting minions until your opponent comes close enough for your torrent to finish off the minions and hit them simultaneously. Rinse and repeat. Until you max out your 1 you will usually not finish clearing waves before your opponent and that's ok. You might get bullied early on, just watch the jungle and play it safe. Chaac does not do great in early game 1v1s. Remember, you're playing the sustain game early on, if you do this properly your opponent will eventually be either forced to back before you or die by being overly aggressive.

-Side note: Start with teleport then build into thorns or blink for conquest
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Other Gamemodes:
I often like to start games with chalice of healing and get my shoguns up as soon as possible. This grants attack speed for the passive and mana for when it's not safe to basic attack. You will be decently protected against magical damage but keep in mind you're not invincible. Once you start taking heavy damage respect the enemy while healing back up with rain dance and chalice. When the opportunity arises, back up and grab your warriors axe for that extra damage and protection. I used to build bluestone pendant for the extra late-game attack speed but I think the lifesteal from warriors axe suits Chaacs already hefty healing much better.

Conquest:
At this point you should have little problem guarding tower, your axe should be instakilling the entire wave of minions. Keep an eye on your laner and callout whenever they're missing. Since you played safe early on be cautious of your laner stealing your blue buff and junglers camps. If you see them trying feel free to throw your axe on the next wave of minions and follow them, your rain dance can slow them and force them to box just be careful if using it at full health as you won't get the full worth out of it. At this point you love boxing your laner, it's unlikely they'll kill you without help if they're warrior or guardian and that's perfect. When boxing you should watch your passive and spam your axe whenever its full. Throw axe, rain dance, torrent, rinse and repeat. Keep an eye on the map and make sure to only use your ultimate as a panic ability unless you are sure you can confirm a kill. The knockup and silence will usually leave the enemies to respect you and it comes with crowd control immunity which can save your life in a pinch.
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Other Gamemodes:
By this point, you should have built shoguns, warriors axe, berserkers shield, and stone cutting sword. You should be noticing the attack speed importance by this point. You should only be picking fights you think you can win but this is where the build starts snowballing. Become more aggressive, frontline for your team as much as possible. You're tanky enough to sustain a few punches but can also deal fair amounts of damage. Remember to try to keep an eye on your passive bar, try to save it for your rain dance or for the next team fight whenever possible. Any mode other than conquest feel free to spam your ult as often as possible, it has a relatively low cooldown and can come back even faster if paired with your passive.

Conquest:
I would consider picking up chalice of the oracle whenever possible to spam wards. At this point of the game you aren't playing for kills, you're playing for your team. Try to not spam your ult or initiate with it anymore, try to combo it with your team. Your ult can absolutely devastate the enemy team if you time it right and hit their damage dealers. You have a decision to make at this point. You're done with your build, you're tanky and you do damage. Pay attention to the needs of your team. If your backline is getting decimated and the support is doing fine frontlining you should immediately turn around and try to save your adc/mage. If you're not dealing with any backline problems feel free to w key into the enemy team, chalice and fully built rain dance combined with pridwen and cadeceus can eat massive amounts of damage. If you're taking more than you can handle just back up and heal it off and you're back in the fight in ~10 seconds. Your axe and rain dance combo can also win your team entire fights if set up right. To reiterate, throw your axe behind the enemy (far away from you as possible in the direction you think they will be running away) then rain dance. Not only does the rain dance movement speed slow stack on itself, but it also reduces attack speed.
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Other Gamemodes:
There isn't much to say for this. At this point in the game you've hopefully gotten into a rhythm. You poke with your 1 which should do considerable damage to squishies. (most will try to dodge it at this point and you can use this to bait their dash) You want to be comboing your axe and rain dance to slow the enemies and allow your team to punish them. Shield of regrowth will help force this if the enemy is shying from team fights. Try to use your ult as mainly a silence on the damage dealers and only use it for the beads if in a life or death situation.

One of Chaac's main struggles is mobility. When against gods that limit it even further try to wait until they cast those abilities first before throwing yourself into the fight, it can make the difference between dying or getting kills. Poke as much as humanly possible with his 1 and try to always keep your passive ready. Remember you always want an axe on the ground to get full use out of torrent and rain dance. Play it safe early and get more aggressive as the game goes on. Thanks for checking out my first God guide, I hope this helped in some way and enjoy playing as the god of rain!