While you hold the Weapon of Kas these other effects take place.

• All holy water within 10 feet blackened and useless.
• All creatures or plants within 10 feet of you that have a challenge rating of 0 or have 1 hit point Die instantly. 
• You have resistance to necrotic damage. 
• You gain the ability to retaliate. - when a creature hits you with an attack within 5 feet of you you can use your reaction to make an attack against them.