So I recently got back into Guild Wars 2 after discovering two of my good friends actually have accounts. That, and the fact that the big boss Tequatl has been revamped, I thought I'd give it another go. Anyway, the new fight is fucking HARD. Like, you need 130+ people actively strategizing and working together hard. It's not enough to just have a lot of people, you actually need to understand the fight and all that needs to happen in order to kill him. It's also timed, so if you don't kill him in 15 minutes, you gotta wait another 1 hour 30 minutes. In the two tries I've done, he was at like 95% health when he left. Barely a scratch. Here's a good video that gives you a sense of the fight and what you have to do to actually kill him.