Otherworldy Patron: Old Man Winter

Active for one night a year, Old Man Winter cannot possibly fulfil his task on his own. It is to that end that he bequeaths his powers to others for the promise that one night a year, you will deliver his gifts to all the good girls and boys.

Your patron gives you a large bag referred to as a Sack. The Sack has an interior space considerably larger than its outside dimensions, roughly 4 feet in diameter at the mouth and 4 feet deep. The bag can hold any amount of items as long as they can fit through its opening. The bag weighs 30 pounds and always appears full, regardless of its contents. Retrieving an item from the bag requires an action. The bag cannot be overloaded, pierced, or torn. If the bag is tuned inside out, its contents spill forth, unharmed, but the bag must be put right before it can be used again. Breathing creatures inside the bag can survive up to a number of minutes equal to 10 divided by the number of creatures (minimum of 1 minute), after with time they begin to suffocate. 

If you lose your Sack, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and it destroys the previous Sack. The sack turn to snow when you die and all the items contained within spill out. 

Placing a Sack inside an extradimensional space created by a Handy Haversack, Portable Hole, or similar item instantly destroy both items. Inserting another extradimensional item into the Sack however will immediately eject the item.

You can dismiss the Sack with no action, and summon it again to your hand as an action.

 

CREDIT 

Designed by Fazhira on DMs Guild, /u/Fazhira on reddit, or d'ArtagnonDnD on patreon. 

Expanded Spell List

Old Man Winter 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.

Bonus Proficiency

You gain proficiency with the Insight skill.

Heart's Desire

Starting at 1st level, you gain an innate understanding of what a person's heart desires. You can see what any creature you can see withing 30 feet of you wants most. 

Frosty Fade

Starting at 6th level, you can vanish in a flurry of snow in response to harm. When you take damage, you can use your reaction to turn invisible and teleport up to 60 feet to an unoccupied space you can see. You remain invisible until the stat of your next turn or until you attack or cast a spell. 

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

The Long Night

Beginning at 10th level, you gain resistance to cold damage and have advantage on saving throws against exhaustion. 

Winter Retreat

Starting at 14th level, you gain the ability to send yourself and your allies to a cabin in Father Winter's realm in the Feywild.

By performing a special ritual over the course of 5 minutes, you shift yourself and up to ten creatures you can see to the cabin. You and those creatures gain the benefits of a short rest while huddled up in the cabin. You then return to the spaces you all occupied when you used this ability, with no time having passed in the world.

During this short rest, you and the creatures you take with you can make use of any potions available during a rest that affects only you and the creatures with you.

Once you use this ability, you cannot use it again until you complete a long rest.