The Collection

As one bound to a collection of trinkets with dubious origins you will find conflict and adventure follow you.  The items themselves seem to whisper with promise of the dark powers they contain.  As you gain experience and power the collection grows as well.  Where you might have begun as a simple hawker trying to carve out a living in a bazaar you will swell with power and influence as your customers learn your knick-knacks can make wishes come true.  You'll carry your store with you.  Eventually you will be able to confer malevolent life on your collection until your wares can bestow the greatest of arcane powers upon those you choose.

Pride of the Collector

You become proficient in History. If already proficient you may double your proficiency bonus unless you receive such a benefit from another source. 

Collector's Box

At 1st level you acquire a container of tiny or small size in which is stored a number of trinkets equal to your Level + Proficiency bonus.  This container has an AC of 18 and hit points equal to your warlock level.  It is immune to psychic and poison damage.  The items within have dark histories which sometimes involve an ironic twist.  You can use any of these trinkets as a focus for your warlock spells.  As an action you can expend a Warlock spell slot as you give one of these trinkets to another creature.  Expending a spell slot in this way imbues the trinket with a warlock spell you know and 1 charge.  

The recipient can use an action to cast the spell from the trinket using your spell attack modifier or saving throw DC as if cast with a spell slot of your warlock spell slot level. The creature cannot rid itself of the object until you accept its return, they receive the effect of a Remove Curse spell, or dies.  In any case, lost or destroyed trinkets are returned to your Collection when you complete a long rest.

You can have a number of imbued trinkets in existence equal to your Proficiency bonus.  If you Imbue another trinket, the oldest loses its charge and returns to your Collection after your next long rest.

If your Collector's Box is destroyed you can perform a 1 hour ritual on a similar item during a short rest to create another.

If you choose the Pact of the Talisman at 3rd level you can choose any Trinket to function as your Talisman.  You can choose a new Trinket to be your Talisman at the end of any short or long rest as long as its on the same plane.

Shop of Horrors

Beginning at 6th level you can use your action to open your Collector's Box in such a way that it creates a doorway into an extradimensional space.  The doorway can be any shape or color, appearing as a misty gate, tunnel into darkness, or an inviting door with window dressing and signage.  The door has the same statistics as your Collector's Box.  It appears on a surface within 10 feet, sized appropriately for you, .  It can be set into a wall or floor or be freestanding.  Entry is only possible from one side.

The extradimensional space inside is a 15 ft cube.  It looks like a shop decorated to your tastes which prominently displays your Collection.  It always retains a breathable atmosphere and ideal climate for maintaining your Collection. Pressure does not equalize when the door is opened.  Other objects and equipment can be stored in this space provided they can fit through the door and do not exceed 15 feet in any dimension.  They will appear arranged as you wish.

The door remains where it was opened until you use an action to return it to the form of your Collection Box.  You can open your Collection Box in this way once and must complete a long rest before doing so again.

If the door is destroyed it returns to the form of your Collection Box and any creatures inside are harmlessly ejected to the nearest empty spaces.

Malevolent Memorabilia

At 10th level you can cast Animate Objects on your Trinkets from your Collection animating up to 10 of the tiny objects.  While animated the  trinkets assume a whimsical or sinister air and are considered magical for the purposes of overcoming damage resistances and immunity.  You can cast the spell in this way once and must complete a long rest or expend a warlock spell slot to do so again.

 

Piece de Resistance

At 14th level you can use an action to expend a use of one of your Mystic Arcanum as you give a trinket in your collection to another creature.  That creature can use an action to expend the charge and cast the spell using your spell attack bonus or saving throw DC.  You can only have one such item in existence at a time.