Couple of quick questions;
1. Does being in a Clan offer any type of bonus’ above that of playing with friends etc?
2. While I was merrily running around the Dreadnaught looking for Calcified Fragments I happened across a room where there were two guys constantly summoning Oryx lieutenants, sometimes two or three at a time – I joined in and got some pretty good gear level 305-310 stuff in a relatively short space of time from the Chest on the platform. After a while I figured out what the hell was going on and realised that I too had some Runes to summon someone – I did this twice but on both occasions only one spawned. So my question is; What is the Room, how do I get more of these Runes (do they show in my inventory) and how do I summon more than one at a time?
Cheers
Answer 1: Not really. It just means if you have an active clan with lots of players you can arrange for "group" games like raids, Challenge of Elders, PvP etc. Some clans may do more "offline" stuff but I don't think there is any distinct bonus within the game world for being a member of a clan.
Answer 2: Ah the Court of Oryx (CoO), fun times

there are three levels of bosses:
Level 1: Is a Solo Lieutenant from the Court of Oryx (e.g. Vorlog, Kragour etc)
Level 2: Is a combination of 2 Lieutenant's from the Court of Oryx (e.g. Vorlag + Kragour
Level 3: Will be one of 3 Ultra's They rotate on a three week cycle.
These tiers are activated from having reciprocal runes (level 1 - White Runes) , Stolen Runes (level 2 - Blue Runes) and Antiquated runes (level 3 - Purple runes)
The stolen and antiquated runes require "charging" by three of the previous tier i.e. you need to run 3 reciprocal runes to charge a stolen rune and 3 stolen runes to charge an antiquated rune.
You don't have to run the runes yourself as you can just join others popping their runes.
Each of the runes are used in the left hand side of the CoO as you look at the gateway where the bosses come out. The nearest one is for Level 1, the furthest Level 3.
Runes drop at random in the game world, given as rewards or purchased from Eris at the tower.
Hopefully that answers your question.