After testing this build a little bit more, I have seen that the Relic of Midnight King is not that worth it with Portals; you don't have as many interrupts as other variations and you don't take profit of it. Here's a variation of this build without Portals: gw2skills.net/editor/?PiABgqx/llyuYqMKGKOsXlxKA-DaIPjMlC9qCc8tBAA If you want to play Portals, you can play Relic of Isgarren for more dueling, Thief/Fireworks for roaming, or Nourys, which I am trying it now. Thanks for watching! :)
It depends on your playstyle or what you want to play. You can use GS with top first trait on domi or powerblock with mantra. About relics, the ones I said in my comment. No more things, it's been 2 weeks after the video, so the build still the same :)