Do I just go to any unopened rift tear in the world and use the item? 2. Can I solo it at 43 as a mage? If not, can I at any point, or is it a group rift? 3. Is is possible to fail the rift and lose ...

I've been trying to work on a tank build pretty much all day and still nothing feels right. So far I've tried 32 Paly/24 Reaver/10 Warlord and 24 Reaver/22 Void Knight/20 Paly. Both feel very clunky.