I’m gonna stop you really quick right here.
No, there isn’t a viable way to play Attikus focused on tanking damage.
There’s some good questions you need to ask yourself:
Why are you playing Attikus as a tank, when Galilea, Boldur, and Montana exist? (All of whom have hard CC and significantly higher survivability)
What are you hoping to accomplish as a tank with Attikus?
Which role are you looking to fill on your team with this build?
If you can answer some of those questions for me, I’d be happy to sit down and theory craft a flawless tank Attikus build with you.
Attikus, ironically, is not designed to tank damage. You cannot stay in lane for very long before being pushed back, no matter how much lifesteal or how much health, regen, or damage reduction you have. You are a big, slow melee character. It takes you a very long time to get in a position where you can damage enemies, and by that point you have taken a lot of damage… and if you pick Brawler’s Boon over Tenacity (the worst mistake you could possibly make playing as Attikus), you won’t do enough damage to so much as tickle whoever you’re attacking.
You can, however play as a tanky disruptor without much trouble (and without wasting your gear and helix options on non-DPS options). If an ally is being attacked, Pounce (or just sprint) in and get between your ally and the enemy. It will be very hard for them to shoot around you to damage your ally, giving your ally plenty of time to escape… and you can potentially push back the enemy or even score a kill.
For gear, imo, you need a shard generator (for leveling, mostly), and a mobility item (rare Jennerit Sprint Speed or Epic Rouge Movement are both good options). Your last option should be a rare or legendary attack speed item or Bola’s Target Finder, but you might enjoy a rare damage reduction item or Blissbeast’s Skullplate while learning to play him.