defeating turtle

[Metathron]

You can't use rage in boss battles. Period.

The portal he's referring to is an ability of the demon unit (level 4), which I was wondering about, specifically where he got it from since prior to beating the turtle you only have access to the first continent. Probably one of the taverns had it on offer. I'm thinking the one in Arlania with the dragon's tooth quest? Am I right?

[Elwin]

U cant use rages against obsses but there are only 3 of them, and except turtle you dont have to kill them and they are very easy

[easytarget]

thx for the follow up answers gents