he thing is I'm not sure if it's Melee, Ranged or Magic.

yes, you have a point there.
Most monsters are either melee, magic, or range attack.
There is one that i remember, which is both melee and magic (the Red Dragon).
There is a couple that are both melee and range attack (the Vigilator, and the War Chaang).
And there is a few that are NO attack at all, like Lord Arianthus, the Gelatinous Cube, the Shadowy Presence, the Angel of Light, etc.