Re: Ominous Portals ? Impossibru !
items are your friend, skills too.
your running out of SP and units are charmed buy yourself a FUCK-TON of hp potions SP potions and clarity powder (removes charm) from the church, hell if you can, buy blood of revival x 100.
And as worldendDominator suggested dark resist is helpful. mutated demon necklaces, yuela and servalwis dark armor equiped with nyx gems (dark resist gems) and if its only dark and physical dmg they deal ragsmuena should be able to tank the lot of them while u snipe em from a few squares away.
make use of everything u can, hard mode is hard for a reason
that ones not even the hardest of lyphia and evelyns missions
on a side note ( and know this was done on normal mode) i teleported wil up to lyphia and eve with kohakurens "displace" skill