The Frozen Serpent

Your patron is a great serpent whose nature is is to spread chaos and nurture the frozen wastes. It comes from the depths below the ice, the space beyond reality, or it could be one of the elder gods known only in legends. Its motives are incomprehensible to mortals, and its knowledge so immense and ancient that even the greatest libraries pale in comparison to the vast secrets it holds. The Great serpent might be unaware of your existence or entirely indifferent to you, but the secrets you have learned allow you to draw your magic from it.

Expanded Spell List

The Great Old One lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Great Old One Expanded Spells

Spell Level	Spells
1st	dissonant whispers, [Tooltip Not Found]
2nd	detect thoughts, [Tooltip Not Found]
3rd	clairvoyance, sending
4th	dominate beast, [Tooltip Not Found]
5th	dominate person, telekinesis

Frost pathing

Starting level 1, you can walk on water having it freeze beneath your feet and you're able to keep your balance on even the slipperiest of surfaces.

Frost Wrath - Rime

At 6th level, you learn to magically ward yourself, and a rime will surround your body, granting temporary hit points equal to your level + charisma modifier
When the rime disperses or is broken it'll conjure a rime blast in your left hand and you'll be granted a bonus action opportunity next turn to blast an enemy with this rime blast.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Frozen Soul

Starting at 10th level, your soul becomes one with the frost, and you gain resistance to frost damage and you'll start radiating cold which grants you a +2 to your AC.

Winter

At 14th level, you gain the ability to unleash the frozen soul within you, you create a snowstorm around you that obscures allies granting them +2 to AC and damages enemies for 10d6