WitherBlade

So I saw the Wither Dragon drops a "Wither Blade" and here is what I think it is.

P.S. Feel free to make minor edits from time to time.

The Blade
The Wither Blade is a thing that does:
 * 1) It does 12 damage (49 on crit hit)
 * 2) When you hold it, you get fire resistance and poison immunity.
 * 3) Q+Shift to shoot fireballs with a rate of 1 per 0.8 secs
 * 4) F to fly
 * 5) Right click to spawn acid in a 1x4 radius in front of you.