You call upon the holiday spirits to infuse your eldritch powers with the magic of the season. As you cast Yuletide Pact, your eyes glimmer with a warm, festive light, and a subtle scent of evergreen and cinnamon fills the air. Your patron, whether Fey, Fiend, or Great Old One, grants you a temporary boon inspired by the joyous time of year.

While under the effects of Yuletide Pact, you gain the following benefits:

1. Frostbound Strikes: Your eldritch blasts, melee attacks, and spells deal an additional 1d6 cold damage. The damage increases to 2d6 at 5th level, 3d6 at 11th level, and 4d6 at 17th level.

2. Gift of Resilience: You have advantage on saving throws against being frightened or charmed.

3. Festive Presence: As a bonus action, you can project an aura of festive magic in a 10-foot radius. Allies within this radius gain temporary hit points equal to your Charisma modifier at the start of their turn.

Casting at Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the cold damage of your attacks and spells increases by an additional 1d6 for each slot level above 3rd.

Roleplaying Note: Yuletide Pact is not just a display of power but a manifestation of the warlock's connection to the holiday season. It might include playful jingles or whispers from the patron, further enhancing the festive atmosphere. The warlock becomes a beacon of holiday cheer, blending their dark powers with the magic of celebration.