Blizzard Entertainment created six core games: Orcs & Humans, II, III, World of Warcraft, Hearthstone, and Warcraft Rumble. First three games are real-time strategy games, fourth is MMORPG. World of Warcraft became world's largest subscription-based MMORPG in 2008
Thrall (originally Go'el) was created by Chris Metzen for Warcraft Adventures. He was raised as a slave by Aedelas Blackmoore, trained as a gladiator. Thrall escaped with the help of human girl Taretha Foxton. He learned compassion and honor from Taretha and Sergeant
Kil'jaeden created the Lich King from Ner'zhul's spirit to weaken Azeroth. Ner'zhul was trapped in ice and transformed into the Lich King. The Lich King established the Scourge in Northrend using undead servants
Frost is a Two-Hand/Dual-Wield plate DPS specialization focusing on physical/magical damage. Starts at level 8 as a hero class, available to all races except Dracthyr. Excels in 3-target cleave damage without sacrificing single-target damage
Choc martial provides crowd control and 5% stamina bonus. Alliance's Choc racial useful against Rogues for poison removal
Destruction Warlock excels in both single target and AoE damage. Least ramp-up time among Warlock specializations. Features powerful Demonic Gateway raid cooldown. Can pressure priority targets and cleave through Havoc