My answer: Yes to all yes or no questions for the how do you get it ones
1st one: By killing elite onyx which is in the portal underground but before you do you need to have shadow minion disguise which you can obtain by killing elite red dragon 76 times and you have to be 76 to access it, oh and you have to destroy those red rocks too.
2nd one: Killing the elite red dragon 76 times lol..