I suppose this would be the best section to add tidbits and advice for each component of Geb's kit, but before that, let me explain the leveling order.

90% of the time, you are going to want to start with Shock Wave (his 2). It's safe and reliable wave clear and an alright early game CC to disrupt the enemy duo. Remember, Geb's 2 does more damage and applies a greater knock-up the closer Geb is to his target. Because of this, you're generally going to want to fire Shock Wave at point-blank range for maximum damage and knock-up.

What you grab for level two depends on your lane match-up. If you want more clear and offensive potential, grab Roll Out (his 1). If the match-up is a little sketchy and you want to play it safe, grab Stone Shield (his 3). I'll further explain Geb's 1 and 3 later.

After you have invested one point in Geb's 1, 2, and 3, you have a choice to make: max his 2 first or his 3. Personally, I like maxing his 2 first, so that I can clear the wave easier and do more damage in the early game. But if you have an ADC that clears the wave really well or want to play safer, maxing the Shield works too.

Don't level Geb's ultimate past level one until his 2 and 3 are maxed. Leveling Cataclysm only increases the damage by 5% and stun duration by 0.1 seconds. You are much better off increasing Stone Shield's health or Shock Wave's damage.

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Ability Tips:

Passive: There's not really much to say about Geb's passive. In fact, it's probably one of the simplest passives in the game. Crits only do 25% more damage instead of 100%. That's it.

Roll Out (1): Roll Out is a unique escape. As mentioned earlier, Roll Out can be easily interrupted by any hard CC or by an enemy literally standing right in front of Geb. Because of this, try to only use Roll Out as an escape if you have enough room to roll away. Also, after 3 seconds, you become CC immune. Because of this, if you start Roll Out a little early, you can avoid some powerful CCs, like Da Ji and Ares ults. Lastly, it's important to remember that Roll Out still applies a slow and, after building up for 3 seconds, a knock-back. It's perfectly okay to use your Roll Out at point-blank range and only do 50% damage to apply the slow and/or finish targets off.

Shock Wave (2): Aside from the detail mentioned above, there's really only one more tip I could offer for Shock Wave. Although knock-ups are some of the shortest lasting forms of Crowd Control, they make up for it by not being affected by diminishing returns. Therefore, whenever an enemy is affected by a hard CC, you should wait until the CC is about to wear off and then use your Shock Wave to knock them up (heh). That way, enemies are CCed for as long as possible.

Stone Shield (3): If you only take one thing from this guide, please let it be this: Geb shield is a CC cleanse. You plop a shield onto someone, and you get rid of all CC effects on that person. Ymir Freeze? Gone. They're in Fenrir's mouth? Not anymore. They're being whisked around at 300 mph in Xing Tian's ult? Not if Stone Shield is off cooldown. However, there's a time to CC cleanse and there's a time to use Geb shield as, well, a shield. There's no point in holding onto your shield to CC cleanse if your teammate is already dead.

For example, you shouldn't look to use your shield to cleanse Ymir's Frost Breath if your teammate only has 100 health. Unfortunately, death is an uncleansable CC.

Also, something that I see in a lot of new Geb players is that they'll place their shields on low health teammates that are already safe. Listen, I get it. It's embarrassing and frustrating to see a teammate die in front of you while you still have Stone Shield up, but you should try and use your shield when you're sure it's going to help someone. Your shield is on an 18 second cooldown, 16.2 seconds with 10% CDR, and 10.8 seconds with 40%. In other words, Geb's 3 pretty much always has a relatively long cooldown. Try to not use your shield on teammates that don't currently need it.

Cataclysm (Ult): Finally, let's talk about the ult. There's not really that many intricacies about Cataclysm. It's a simple AoE stun that gets the job done. Do note that Geb's ult is not true damage and its damage is a percentage of the targets' current health. What this means is that you'll do more damage against enemies with more health, but that damage is affected by mitigations. I'm not entirely sure if this damage is also affected by penetration, but let's face it; you're not gonna build penetration on support Geb.