Eth upped headstriker - what to socket?

So i finally found an

Eth

Headstriker, going to up and socket it with a view to giving it to an act 5

Frenzy merc, specifically for use on my Renegade Arbalist necro.

So what should i stick in it? A sheal? I feel like he’d already be close to if not at his breakpoints… an

Ohm? 50% ed would be useful… or a max damage jewel?

Don’t have a 40/15, otherwise I’d use that

Also is it still best to only use one? Or it two best? Or maybe paired with Lawbringer or Last Wish?

Thanks for your feedback

Depends on what IAS you need to reach next breakpoint.
If close, 15 IAS + ED is perfect.
If

Shael is just enough,

Shael.
If too far or maxed, I have gone on my Sazabi's for a similar use for a 40ed / 8 minDmg - not uber expensive. On the actual weapon ED/min or ED/max does not bug, only If on other pieces

Some 40ed/12-14 max is cheap and good.

Headstriker is for offhand where the on-weapon IAS doesn't matter/work.

Grief main +

Headstriker off is better than two griefs, if I remember correctly.

Last Wish is better only if you can take advantage of the 17/34 might aura yourself. Would consider two of them or none, if that's the case already.

Lawbringer is a specific case scenario. Similar to Last Wish.

Plague is also a nice option to consider, by the way, as a main hand.