I'm sorry, but I can't leave this without getting pointed out:
>comes to the thread that explains the boss mechanics & gives recommendations in the first post
>asks what the boss mechanics are & how to deal with it
OK.
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I guess that Ilyanka eydolon is just a pile of orbs, nothing more - if you have Tiamat, she is much better, if you don't have Tiamat - you can't fill grid with water eydos anyway so don't bother about her, at least before both ssr weapons and apotheosis are bought. Btw, i like idea to get 20 HE for 3+3+0+0 each, i can get much more mats if use them for ulties.
It's very much a do-or-die fight, sadly. If you're struggling, just understand that unleash EVERYTHING right off the bat. If you get her to 50% or a bit more, just attack her twice normally. She'll use her first two turns to buff up. Then Dispel her once and you should be good... hopefully.
I find this fight really, really stupid since you either have the damage output to do it, or you don't. There is very little room to maneuver.
So let me understand this ... dont get the double atk weapon ... but get the other ssr one ...
If you have to choose, yes. GET the Hammer, as it is good.
Everything else? Eh, if you can, farm it all and store it. But at the moment, it doesn't look like there is a use for them. Notice that there are 3k Jewels, 20 pots and 10+10 books you might want to consider farming.
I can see no reason not to get gun. I don't know any water hime with so high base multihit that they could get a penalty from high DATA on weapons (like Cybele U), just some with coulpe turns guaranted triple hit like Atlanta. So it will be less usefull then assault, but still give some buff. And it's still medium defender too so things are not so bad. Yes, hammer is better, but price is very high. If you can farm a lot ulties - get both weapons, else - get at least a gun if you can't get mlb hammer. Eydolon is garbage, just pile of orbs, Tiamat is much better. Don't forget to get 20 HE.