Warcraft
The series is made up of five core games: "" , "Warcraft II: Tides of Darkness" , "Warcraft III: Reign of Chaos" , "World of Warcraft" , and "Hearthstone" . 
<triplet> World of Warcraft <subj> Warcraft <obj> part of the series <triplet> Warcraft <subj> World of Warcraft <obj> has part <subj> Hearthstone <obj> has part <triplet> Hearthstone <subj> Warcraft <obj> part of the series