Note: You do NOT need Perfected Gear to use this build at all.
The Infinity tank build since its inception in the Harrowstorm patch focuses on Dragonknight tanking strictly four man content on normal, veteran and veteran hard mode levels (Dungeons and Arenas).
This build is NOT recommended to take to Veteran Trials.
Infinity has an emphasis on providing crowd control, group utility and increasing your group's DPS while offering a near endless amount of sustain for yourself and the group.
The theme of infinite sustain is quite reliant on the interactions between the item sets and the Dragonknight class toolkit of "recycling" Magicka into Stamina, Stamina into Magicka and providing more for your group beyond the usual taunt and block.
For a beginner's guide to tanking in The Elder Scrolls Online, you can refer to this guide.
Recommended Races for this build are Imperial, Nord, Argonian, Breton and Redguard. For race recommendations you can refer to this video.
Recommended potion for this build is an Essence of Health (tri-stat).
Recommended food for this build is Bewitched Sugar Skulls.
Recommended Mundus Stone is The Atronach.
For gameplay and the video showcasing this build, refer to the video above.