is it Trauma?
Pictures speak louder than words, (in the castle, he paintings)
An ancient system you must learn, (you have to find 3 paintings and match up the words)
Guardian of the most high, (you can draw Leviathan, n in the gf menu hes high up in the order)
Mental breakdown al around. (Trauma, being the name of the creature but also it referring to mental breakdown)
im probably wrong lol XD