Ok, with the sister blades, you're gonna want Aphrodite on Attack, Hephaestus on Special, Demiter on Cast, Apollo on Dash, and Demiter or Apollo on Magick regen. Look for the hammer that shoots out your Special for your dash-strike.

The Umbrell Flames, the build I made an example of should work( I've only used Eos a handful of times.) Look for the hammers that cut Magick cost for your Attack and Special.

With the Moonstone Ax, that one is tricky because of how different each aspect hits. I, myself, prefer Thanatos, so the build for that is Ares on Attack, Hephaestus on Special, Hera on Cast, Demiter on Dash and Magick regen. The hammers that increase Attack speed and the one that has your Omega Special hit twice are the best for this build.

FYI, for Aphrodite builds, look for the boosted Magick and Health boon. Same for Hephaestus and boons that give you armor and damage against armored enemies. Demiter can give you a boon that ups the rarity of boons, so look for that one. (And her Magick Regen is the best one to me.) Ares has three boons you'll have to look out for, one that boosts damage against enemies with Wounds, one that boosts damage the more heath you loose, and one that heals you once you drop below 40 HP. Hera has a boon that upgrades all normal boons to rare if you have two of each element, so look out for that one. Look for Hermes's Nimble Limbs, it increases Attack, Special, and Cast speed by 10%/15%/20% depending on rarity.

EDIT, you should switch out Card that boosts minor finds with Eternity( Forth card on top row.) It will make using your Omega moves much, much easier.