In TERA they have an easy mode of the Queen fight that doesn't drop any serious loot and is / was used for practice, to go later to the HM (original) version of it. It was added later in the game and had, iirc, no one-shot mechanics but they could still k.o. you if you weren't well geared.
Might be not a bad idea to add something like that to here as well, because as we know, Echo buff doesn't really help people with the things they are wiping on. The increased health points, damage and healing is already done by better gear.

Whether they add that or not I'd recommend OP to make a PF group and add people to a LS that are willing to learn and clear it with you. It isn't really all that difficult.