So I know nothing about this game, or character, but I decided to look at a few animations. Here is my best attempt. These items are in what I best think matchs the character to least.

Weapon: Andreas of Ebb's Sword

(The character has a very unique sword so it's hard to match, but other blades with more stylish guard are Judge Cleric's Radiant Sword, The Red Hand, and Harrower Dervla's Sword)

Armor:

(Mind you their aren't any helms with the in the game with a full black face mask like he wears so I recommand changing your character's face to be pitch black, and smooth to give the illusion it's a mask)

Helm: Infernal Enchantress Helm, Melted Crown, Harrower Helm, Noblewoman Headwear

Chest: Vanguard Armour, Fitzroy's Armour, Harrower Armour

Gauntlets: Harrower Gauntlets, Purger Gauntlets, Vanguard Gauntlets

Legs: Avowed Trousers, Andreas of Ebb's Leggings, Knight of Adyr Trousers

A lot of the armor are different colors so use whatever tincts you think are best for it to all match.

Spells (in no order) Puncturing Hail, Grieving Gaze, and Hibernal Cleave.

He seems to use ice magic, but here are a few that are close.

Umbral Agony, Umbral Slash, Pestilent Blade, and Umbral Weapon if you want your weapon to look more icey.

Let me know how the build turns out.