blow dart umbrella

umbrella as a blow dart, fires a needle from the tip of the umbrella in an attempt to pierce an opponent.

I am assume the name is literally blow dart umbrella and that the description is what you gave. For future reference, preferred format it:

Name:
Description:
Special Abilities (if applicable):
History (optional):

Anyway, I see nothing wrong with it outright, but you probably want to clarify the kind of needles being blown. Typically, blowdart ammo consists of darts rather than needles, and there are various kinds of needles, so before I offer approval, unless Shadow says otherwise, I'd like to see the ammo added to your description.

And to clarify, I will reiterate: what is the blowdart capable of firing? Sewing needles, accupuncture needles, poison senbon, armor piercing darts etc? Can it launch all types of needles/darts? What ammo will you be using? Anything other than generic types must be made here in weapons. Generic types would include senbon, accupuncture needles, and sewing needles. Non-generic types would be darts with needles, anything with poison, anything with an abnormal material, such as kairoseki, titanium, etc.

exploding needles
the umbrella looks like this

Alright, so exploding needles. Arthey thick and pointed, or thin and dull? Long, or short? Light or heavy? How big is the explosion? How powerful is the explosion? When you say blow dart, is it a breath-powered mechanism, or a machine-powered mechanism?

This stuff matters. We have a lot of different types of characters, and they will want to take advantage of your weapon when roleplaying with you just as much as you will want to take advantage of it yourself. To do that, we need to know just how powerful the needles are and how many can be fired, be it a vague amount determined by skill or a fixed amount determined by the weapon.

light thin long pointed needles, and it is machine-powered...this is how it works. the needle will shot out and hit the other person"let say in the arm" and pierce into the other persons arm upon contact the needle if done successfully will explode inside of the persons arm