Scepter of Jehu

An 18 inch silver rod with Redstone handle.
written along the shaft in celestial.
Is 'As you command'
As a bonus action it changes form.
Choose one:
Javelin: 1d6+1 Thrown (range 30/120)
Spear: 1d6+1 Thrown (R 20/60) Versatile 1d8
Pike: 1d10+1 Heavy, Reach, Twohanded
Lance: 1d12+1 Heavy, Special (148 PHB)