About Amateus

So I've been having Amateus for quite a while, and yet I still don't fully understand it's core weapon (the one with a big explosion after a few seconds). I've seen ppl use that core weapon and it explodes really fast. Any idea how they do that or am I thinking wrong? And also, plz tell me a good build for it. Once again, thank you for the infos.

Giant Floating Bomb of Light that blows up and deals massive damage.
You got to make sure that your opponent runs into it.
Best way is to use it right when you see your opponent charging or running at you.
So either stand directly under the PS or closer to the front lines so you are sure to hit someone.

Ama's core sub-weapon got a crappy range but u can kick some lnd ass with it
How it work ? Well, just aim a close enemy and right click it, fast target movement = faster the blow goes up
A lot of ama build in this forum so search for it, he is the best M size art