Item build:
Early game items:
Omniknight Item Build DotA
x2
x2
or
Omniknight Item Build DotA
This build gives you more mana and hp, we can transform the 2 Circlets to 2x Bracers later. I would prefer Salve over Tango because of Omni's hp, but it;s fine to get Tango.
Core items:
x2
Omniknight Item Build DotA
These are cheap items to get, Bracers gives you more strength as well as more mana, while Phase boots gives Omni more MS and it also allows hm to move faster due to Phase, it also solves Omni's lack os ASPD problem.
Mid game objectives:
Omniknight Item Build DotA
This is the item that best fits for Omni, the aura comes in handy when supporting temmates. Lifesteal aura will really benefits teammates, but however you don't want to get this item if your teammates are all ranged.
Omniknight Item Build DotA
Omni has early game mana problems but this item is the slolution to it. It gives him tons of mana as well as the Replenish mana abilitie which is very helpful and makes his sklls spammable. Also, it's very cheap and effective.
Omniknight Item Build DotA
Late game luxries:
Very useful, combined with lvl4 Degen aura's slow, you'll get a 58%slow!
The orb to get instead of Skadi, Maim orb+Degen aura=40%slow.
This item will make you and your teammates unkillable!
Necromonion will take advantage of your slow, and their aura is pretty useful.
Very useful, this item completely solves Omni's mana problem and combined with your aura's slow, you'll get a 68%slow!
Get this if you're palying Omni like a caster.
Optional items:
Having trouble agaist windwalkers?
can't carry anymore items?
Blinkers giving you a hard time?
Need more hp?
Having farming problems?
A extremly risk item to get, but however your ulti+Repel works well with this item.
Get this only if 5/6/7 sec of Ulti isn't enough for you.
Rejected items:
Omniknight Item Build DotA
I saw this item on some Omni's and this isn't really a good item because why would you need to block spells every 20sec when you can just become immune to spells for 20sec?
Omniknight Item Build DotA
You've already got a powerful heal! Although Mek is aoe, but his ulti is aoe heal and makes you immune to physical attacks unlike Mek.
Dps items like. Why would you get Dps items? Omni is NOT a Dpser.
This is a tanking item, if you want to get this item then play Axe instead.
This is only enough for 1 Purification!!!
and
If you want to get these items, then play Luna and Void instead!