During the Shattered Masks event the Kill Task was updated and Silver Tuskers no longer included in the Kill Task total.
Lore & Dialog
Shoichi tells you, "Greetings, have you come to train?"
Shoichi tells you, "There is much you can learn from fighting any opponent. I have specialized in the fighting of Tusker Guards and have learned many, if not all of their weaknesses."
Shoichi tells you, "If you wish to do the same you must first go out and experience combat with these creatures. Return to me after you have killed 500 Tusker Guards and I will reward you."
Shoichi tells you, "Excellent, now go contemplate what you have learned from fighting the Tusker Guards. You may be able to apply these pratices in various different types of combat with a great variety of creatures."
You've earned 20,000,000 experience.
You have been given the title Tusker Blight.
Shoichi tells you, "You have killed many Tusker Guards and have advanced in your skills. Part of our training is knowing when to stop and reflect on what you have done. Come back to me later, after you have thought much on your experiences with the Tusker Guards."