Three ways to use The end Game mechanic:
I have a suggestion to tie end game to hopping servers…
Every time you finsih end game, you get a token in you conan account. This token can be cashed in to start you at level 40 on anther server. This would speed up the grind, and allow people who are on dead servers to move without having to grind the lowest levels.
Start at level 30, and use the token and get a permanent 1st perk in one ability, gain a T4 crafter skill (flawless epic armor, weapon, craft time, etc.) or permanent legendary weapon (cannot be wielded or looted by someone without the perk. Have a special one of each type, and allow you to choose 1 from those.
Can have all three areas from cashing in multiple times (and can change each category every time you complete after that).
Cash in to gain favor of the different cities. They will not attack you, and you can use them as safe house when necessary. You cannot kill them either, but trade with a merchant in the city. You can still knock them out if needing thralls:).
Just my thoughts on giving a reason to start anew.