But when it comes to doing 5 man stuff you'll have your support covered. Necro+Mesmer. Mesmer because portals are always good in dungeons and such, and necro because it's by far the most capable "one man army" for any pve content. I had a blast doing dungeons and group events with a Reaper and Tempest duo.
A better snipe burst class in WvW with none of the drawbacks of clones or being completely cancelled out by guardian reflect spam like Virtuoso. Mesmer used to be better in open world PvE for solo content (which doesn't matter much), but specter came in and it's basically a better scourge with more survivability and DPS.
The Power Herald is a DPS Revenant build for end game content in Guild Wars 2 with a mobile assassin playstyle allowing players who love this in PvP to easil
The 2 best known playstyles are minion master (MM) and Spiteful Spirit (SS). These will also be the ones you will be asked to play most frequently by other party members. In high end PvE, Blood Is Power (BiP) necromancers are very often requested too. It can be upgraded with a scythe snathe (prefix), a scythe grip (suffix) and an inscription. You can carry up to 4 different weapon sets that you can swap with F1, F2, F3 and F4. For the dervish it is important to have multiple scythes ready for use as well as a longbow for pulling monsters to prevent an overaggro. .