To create lvl 4 wings you will need the following items:

First you need to get one of these items:

Deat King's Bone

 Death Beam Knight Soul

 Dark Phoenix Flame

 Hell Maine's Leather

You can find these items:

Tarkan: Death Beam Knight moobs

Icarus: Phoenix of Darkness moobs

Aida2: Hell Maine moobs

LostTower: drop is everywhere, but drop is reduced

The next step is to boil the feather.

Namely: Phoenix Feather

To craft this feather you will need the following items

Wings lvl 3 +9 +4 option minimum

Excelent any item +9 minimum +4 option minimum

Deat King's Bone

Dark Phoenix Flame 

Hell Maine's Leather

Jewel of Chaos

If you managed to craft a Phoenix Feather, then the next stage of crafting is lvl 4 wing

To do this you need:

Any excelent-ancient item +9 minimum + 4 option minimum

Phoenix Feather

Death Beam Knight Soul

Jewel of Chaos

Jewel of Creation

Jewel of Bless Bundle x10

Jewel of Soul Bundle x10

Congratulations!

 You have successfully created lvl 4 wings :)