Berz - hit & kite
Chief Daruma - same thing as before. When it has the shield up, kill the slaves, wait for the shield to disappear and repeat what is said at Berz
Ahriman - stay close but always moving around him, like in a big circle around the boss. If you don't stop moving, he won't cast any thunder directly at you [or very rarely that will happen]. If you can keep a decent distance, you won't ever get hit by his thunder circle attack and can rollx2 back when he casts that shadow foggy attack [you will notice a small animation different from the rest as a warn that it's incoming]
Tiamat - dodge the fireballs, stick close to him and deal damage after position your character in a outside diagonals with any of his feet to prevent him to cause you damage [if you do inside diagonals, his tail may kill you], roll back when he flies to evade any future damage from the fireballs he sends while flying and the "earthquake explosions"