It can be expressed wow power leveling
Gluttony seems to manifest itself in every raid I've attended. Have you ever been on a progression-minded raid where no one busts out the Fish Feast? Besides, Blizzard has done a tremendous job making a variety of food available for your characters.
Drunkenness is also a manifestation of Gluttony, which is incredibly common among the dwarven people. If you're an opponent of the sin, you might find yourself protesting the alcoholic dwarves outside Ironforge. A gluttonous drunk would certainly spend the entire year looking forward to Brewfest.
Greed is a major motivator for the goblins and banking alts littering around the Auction House. If you're a sufferer of the Greed sin, you're constantly yearning to pile even more cash into your ever-growing pockets. Your character may even have studied their economic craft at the hands of a goblin, learning the finest methods for turning a single copper into thousands of gold.
But not all Greed is based on the commerce. A simple street thief might stalk the alleys of Undercity, seeking out unsuspecting victims to sap and rob. Not every thief is a rogue, and thuggish muggings are likely common in the war-torn land of Azeroth.
Sloth is actually a fairly difficult Sin to portray in WoW, because the very nature of a MMO is predicated on action. You're going somewhere, doing something, killing someone. Your characters are in constant motion, and the world is always in some kind of activity around them. But a slothful character probably hasn't mastered all of their class skills, or maybe it's something as simple as a mage who refuses to go to the work of making a magic buffet.
Sloth also doesn't have to be about laziness. It can be expressed as a resistance to change. I suspect hundreds of Night Elves will rebel against their brethren who have taken up Arcane magic, and not all of them because of the harsh lessons learned by the Sindorei. Some will simply feel the winds of change blowing across Kalimdor, and want no part of altering their lifestyle.
Wrath is so easy to roleplay, I almost feel like I shouldn't write about it. A quick-to-anger warrior who rattles his sword at the slightest provocation, or a harsh paladin who lays violent judgements at the slightest hint of vice. A betrayed lover who seeks revenge on the one who done-her-wrong. The opportunities are pretty limitless on how to portray a character whose primary sin is Wrath.
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