After a few months of EZ LFR Mode of the 10-man Tartaric Depths Raid, the normal Tier One version has just opened for testing on PTS (Public Test Shard). This time it has trash packs as well as three mini-bosses Warden Xilmarth, Drahknar, and Illysia.
Managed to sneak past a few packs and first boss to get a 'selfie' with the first mini-boss Warden Xilnarth but that was the limit of my exploring, you can teleport to all the bosses on PTS but trash packs stopped me getting to the other mini-bosses.