Welcome to the guide! I hope you can learn from my experience and champion mechanism.

Conqueror Not rare in the current state of the game and works well with this build. You can get maximum stack really easy and early and it helps you not to fall really hard back after that
Triumph Can be really helpful againist ignite-tops or in brawls
Legend: Tenacity Makes you harder to lock down especially with Mercury's Treads
Coup de Grace You excell at short fight and get the enemy low fast
Bone Plating Helps you trade better in short therms
Overgrowth Helps you get even more hp

Your early is pretty good from level 2 as you deal almost 30% of the enemiy's max health with your Iron Ambassador and the 2 proc of your Hammer Shock. However most of the time you will need to push the enemy to the wall for the required effects. Try to position to the top side of your lane so the enemy will go near the walls. If they get to close to one punish them.

Mid game is your most efficient therm. Noone can stop you you can control the fight with your Keeper's Verdict and your Steadfast Presence. In brawls there is almost noone who can outdo you.

Most importantly don't try to engage too deep. You will die under 4-5 seconds when fully focused. Try protecting your damage dealers and care for enemy engagers. You still unbeatable in brawls and can control the teamfight much. But every teamfight is different you have to make the right choice and noone can prepare you every scenario. Do what you think is best and learn from your mistakes.