Annam's Nail

The weight of this spear makes it incredibly unwieldy to use as a melee weapon.  Making a melee attack with the spear is always at disadvantage, and you can only attack with it once per turn even if you have extra attacks.  Ranged attacks with the spear function normally, and the range is 50/100. The range increases by 10/20 times Strength Modifier.

Made from an especially dense alloy of iron, this spear weighs approximately 5 times the weight of a normal spear.  Both the shaft and head are entirely metal, and the spear requires a Strength of 18 to wield or throw without disadvantage.  The upper third of the shaft of the spear is actually an immovable rod embedded in a rotating metal enclosure.  Twisting the rod enclosure anticlockwise immediately activates the immovable rod, and hitting the butt of the spear with significant force (DC 15 Athletics) deactivates it.  Twisting the rod enclosure clockwise sets up to a 12 second timer that will activate the Immovable Rod after the time has elapsed.   The rod itself follows the normal rules of Immovable Rod, being able to hold up to 8000 pounds and requiring a DC 30 Strength check to move the rod up to 10 feet.  On hit the spear deals (3d10 + Strength Modifier + Proficiency) piercing damage and the target needs to make a (DC 10 + Strength Modifier + Proficiency) Dexterity save or it is Restrained.  Once Restrained the target can try to move the rod or disable the Immovable Rod normally or use an Action to try to dislodge themselves from the spear.  Each attempt to dislodge requires a DC 15 strength saving throw and the target received 4d6 slashing damage whether they succeed or fail.

For ranged attacks this weapon crits on a 19 or 20.

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

Notes: Requires a Strength of 18 or greater, Damage, Combat, Thrown, Versatile, Sap