[quote=@Slime]
Is it possible to invest Might in into a Domain without a Portfolio?

And regarding the Eyes of Reathos, since it's a curse can Helvana study and learn it for free?
[/quote]

Normally, one would obtain a Domain before filling it with Portfolios (although, of course, the investment in obtaining that Domain likely involves some overlapping Portfolios). Portfolios do not have to be associated with Domains. There is no issue there.

As for the Eyes of Reathos, it depends what you want to do with them. Given your Portfolio and the crow theme, Helvana would definitely have an affinity for them and should be able to figure out how they work and possibly how to make more for free. You could probably attune yourself to the Eyes of your crows. However, if you want to do something big (eg. hack into any Eye anywhere and see through it, like Gadar does with ants), that might take a Might to acquire such an ability.