Main quest or side quest

Now there was a self destruct message appearing but there was nothing falling like it did in the movies i think they knew how to build thing s without them falling and now i am more curious about the mana situation

Well technically his point is correct that mana just doesn't manifest itself out of thin air like in other mangas so there must be a source and a powerful one at that which could give out mana for 700 years

Even if this is a fantasy world why is common sense invading well i think it is good for me that i have now 2 objectives

1. finding the source of mana

2. dungeon hunting to uncover more secrets

This is something more objective or atleast i have a specific aim

But i have only one question is this a main quest or a side quest

When i was thinking this i was already on my way out i found a tunnel leading somewhere

I could use earth magic to get out like no one else i think i should write a book on this idea.title : Common sense in another world

While on my way out i found myself in trouble there was a door on the otherside of a 3.4 meter cyclops

So i jumped and stabbed his eye and thus the cyclops was defeated because i also got his brain so i went and finally got out by a teleportation spell i had been keeping with me