Antithesis

The weapon appears to be a simple hilt made from the bone of an unknown creatures, twisted by magic. A small liquid crystal is embedded in the very top of the hilt, glowing a dark purple aura around it and a void black core.

Activation Word: 

Good alignment: Synthesis (in Celestial)

Neutral alignment:  Peace (in primordial)

Evil Alignment: Power (in infernal)

Versatile: takes the shape of whatever versatile weapon the user wishes (must chose type when activating) with the stats of that weapon.  +3 to Atk and Dmg rolls, deals additional 2d10 Cold damage. When activated the blade color will shift depending on the users intentions, black is neutral, blue is righteous, purple is anger, green envy, and so on

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: The Weapon will weight 2lbs no matter the form it takes. Good aligned creatures must make a DC 15 Wisdom saving throw with disadvantage or take 1d10 psychic damage and throw the weapon away from them on a failed saving throw when attempting to attune. Neutral creatures make the same throw without disadvantage or suffer 1d10 psychic damage on a failed save and drop the weapon. Evil creatures are immune to its effects and can pick it up with no harm but still must attune to it. Upon attunement the respective activation word is learned and can be spoken regardless of known languages., Versatile, Sap