This +1 dagger appears unassuming at first. It was crafted by Mylo Piviria, and holds a bronze M in the center of the handle. Should you press this symbol in, it pops up and allows for a 180 degree turn, switching the letter from M, to a W. As you shift this letter, the dagger grows drastically in size, becoming the equivalent of a Gnomish Longsword. If handled by a Small creature, it does not carry the Heavy property, though it does require two hands to hold.
When set to Mini state, it deals 1d4 + prof. magical piercing damage, and does not hold the Thrown property. When set to Wumbo state, the dagger deals 1d10 + prof. magical slashing damage. If you, at any point, do not wield the Wumbo dagger with two hands in its Wumbo state, it will shrink back to Mini, and cannot re-enter the Wumbo state until the next dawn. If it is set back to Mini by flipping the symbol in the handle, it can be set back to Wumbo after one short rest.
You are proficient with this weapon so long as you are a Small creature.
Carved into the metal under the handle's wrapping is the statement "You've got it set to M for mini, when it should be set to W for Wumbo!"
Proficiency with a Dagger allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Nick. When you make the extra attack of the Light property, you can make it as part of the Attack action instead of as a Bonus Action. You can make this extra attack only once per turn.
Notes: Bonus: Magic, Ignore Weapon Property: Thrown, Damage, Combat, Finesse, Light, Thrown, Nick