Demonbone Spear

You have a +2 bonus to attack and damage rolls made with this magic weapon. In addition, when you're damaged by a creature in reach, you may use your reaction to make one melee attack against it with this weapon.

Curse: You're unwilling to part with this weapon while attuned to it. While attuned, you have disadvantage on attack rolls with weapons other than this one. Whenever a hostile creature damages you, you must succeed on a DC 15 Wisdom saving throw or go berserk. While berserk, you must use your action on each of your turns to attack the creature nearest to you with the weapon. If you can make extra attacks as part of the Attack action, you use those extra attacks, moving to attack the next nearest creature after you fell your current target. If you have multiple possible targets, you attack one at random. You're berserk until you start your turn with no creatures within 60 feet of you that you can see or hear. Alternatively, an ally can use an action to make a DC 15 Charisma (Persuasion) check and if successful, you're no longer berserk. Only the Remove Curse spell allows you to end attunement to this item.

Corrupting: This item corrupts. See the "Infernal Item Corruption" section.

Thrown: If a weapon has the Thrown property, you can throw the weapon to make a ranged attack. If the weapon is a melee weapon, you use the same ability modifier for that attack roll and damage roll that you would use for a melee attack with the weapon. For example, if you throw a handaxe, you use your Strength, but if you throw a dagger, you can use either your Strength or your Dexterity, since the dagger has the Finesse property.

Range: A weapon that can be used to make a ranged attack has a range shown in parentheses after the ammunition or thrown property. The range lists two numbers. The first is the weapon's normal range in feet, and the second indicates the weapon's maximum range. When attacking a target beyond normal range, you have disadvantage on the attack roll. You can't attack a target beyond the weapon's long range.

Versatile: This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.

Proficiency: simple, spear Source: Chains of Asmodeus p. 267, Player's Handbook (2014) p. 149