Gear from character creation (Necromancer)
All items shown there are available ingame.
Going by the list of Rikis post, you are looking at the Cabalist armor set, which is easily aquireable by just playing the game:
https://wiki.guildwars2.com/wiki/Cabalist_armor
There are several ways to get it.
Overall notion:
- Dungeons need 5 people (there are exceptions) and have unique armor (and the one you are looking for, but there are easier ways to get this).
- Remember that you can mix and match.
- Color does a a lot in improving how your character looks. Parts of each armor are given parameter, like being metal, leather or fabric, thus dyes might make have other effects there