You've been asked to run a game of D&D-esque fantasy on short notice, and you've got nothing prepared. You're confident in your improvisational skills and your players are awesome, but you want this one cool thing, one playing piece you want to bring to the table that leaves your mark on the session. A focal point around which the events of the game will transpire.
Each player brings their character, and their interpretation of the character, as their offering in this fantasy "potluck". So, what do you bring? Is it an NPC, a location, an item, an organization?
Describe in 1-to-4 sentences, brief but evocative: what's your offering at this potluck, what will be the focal point around which your improvisations will flow? Make it something special, something unique to you, with your own personal flavour. If you were going to write a fantasy novel, your magnum opus... this one thing would definitely be in it.
(Afterwards, we can use your offerings as seeds for adventure, or perhaps one or more random tables: a crowd-sourced compendium of cool fantasy knick-knacks, or an Oracle for full-colour fantasy gaming.)