The time when Ronan saw the beast, he knew there was nothing he can do to get out of this unless he use everything he has, and what else if not his awaken form.
Others seeing one of their best has awaken, they also followed behind the suit and went into their awaken modes.
Equiping ones awaken form, wasn't that easy as it sounds, since a handful majority fails to. It's a troublesome experience since in this form, the consumption of mc cells is higher than usual. And the feeling itself, isn't that for pleasure.
Mostly, people unlock their awaken form at the age of twenty or so, after experiencing mixed feeling in during their battles, which mean that, these teenagers are talented somehow.
The wave of different kind of arcana, with different colour rained together to the beast.
With their awakens form, their arcana were now twice powerful than they should be.