Giving the Law to Heathens

Tyr is a Warrior under the Norse Pantheon. He's generally considered a balanced god, with strong late-game CC and front-line potential, but multiple counters to even him out. If you like being a tank and setting up potential kills for team members, then Tyr is definitely a god to try out. Although his early game is quite underwhelming, it's his mid-to-late-game that you seek to get to. At that point, you'll begin to see the tank side of him as you attack your opponent under their own tower, wisely utilizing your strong healing to keep yourself in the fight.
Granted, that's not the best option for any god, but Tyr is able to push lanes quite easily once his mid-game comes online. Despite what was said earlier about Tyr setting up kills for his team, the Lawgiver is surprisingly strong in his attacks. His first two abilities can combo into a nasty CC-filled sucker punch that can eliminate unwary targets.
Tyr is also amazing at retreating from tough spots. He has three escapes at the ready, almost at all times. His first ability is a dash that allows him to cover ground quickly, and his third ability allows him to switch his stance, allowing for a second use of that first ability. His ultimate is his third escape, capable of moving him massive distances.
So why choose Tyr? Put simply: the guy is a BAMF!

Pros:
- Excellent clear
- Good front-liner and tank
- Excels at pushing lanes
- Ability damage is quite strong
- Great sustain
- Good mobility and escapes
- Passive is great
- Easily sets up kills for team
- Combo can lock down enemies with CC and disarms

Cons:
- Mana-heavy early and mid-game
- Ultimate is nothing special
- Lots of counters
- Relies almost solely on hitting his combo to be a contribution to team-fights

Extra Thoughts:
- While his ultimate truly is nothing special, it is CC-immune, meaning he can ignore hard CC, such as Awilix or Geb
- His combo is his damage, therefore he's very reliant on CDR
- His mana is only an issue in the first half of the game

Tyr is exceptional at opening up enemy gods for the killing blow. His unique combo is a hard-hitting CC move that can push a number of unwary enemies right into a line of damage from your team. This god has more than one optimal way of engaging in team fights, although you do want to try to be the driving force on your team.
First and foremost, front-line brawling. Tyr will be a known presence at the onset of the fight, but with a relic like Blink, Tyr can quickly disrupt an enemy team's formation. Activating that relic will allow you to pop in and CC an enemy back into your camp. While this can be tricky if the enemy team has been keeping track of your usage of Blink, a skilled Tyr can still catch a squishy Hunter or Mage by surprise.
Another good strategy is to let the Support tank while you come in from behind. Providing they don't have wards up, you can catch the enemy by surprise, pinning them while separating them from their team, effectively killing them if your team is nearby to capitalize.

Standard Build
This is an easy, safe build that offers new players good tank and sustain. For the most part, this build may even be enough until the end of the game. The big "?" on this build is the use of Gladiator's Shield. This item is effective at all stages of the game, but definitely falls off. The reason this remains in the standard build is due to the fact that, in my experience, the build has worked consistently. However, this build gives lots of flexibility on that last item pick when one wants to trade out the Gladiator's Shield.

Late-Game Tank
This, in my view, is a great tank build for the Lawgiver. Blackthorn Hammer is an underrated item that provides soft CDR and great Health and Mana, and even some Power to beef your build up. With this item, you will be far tankier and won't have to rely on any sort of Mana potions or buffs, as the passive will nearly always keep you at a good amounf of Mana.

Optional Full Tank Build
Sometimes, a team may have a Support that cannot frontline. Aphrodite and Chang'e come to mind. While they're not popular in that role anymore, it's possible, especially in a casual match. That's why you may have to become the de facto Support. In that case, this build should help you reach great levels of tankiness.