It Was Worth Every Ritual Stone

You need three Shan'ze Ritual Stones to summon each boss. Reliable weekly sources are the rare elites and treasure chests scattered across the Isle of Thunder.

If you are Exalted with your Isle of Thunder faction, buy Elder Charms from Commander Lo Ping on Niu Zao Temple in Townlong Steppes using Lesser Charms (20 Lesser Charms each, cap of 20 Elder Charms), then spend 15 Elder Charms at your faction Quartermaster on the Isle of Thunder — Vasarin or Hiren — to purchase a Sunreaver Bounty or Arcane Trove, which each have roughly a 20% chance to contain a Ritual Stone.

Use your Ritual Stones to summon and defeat all three Spirit Champions: Echo of Kros at 55.2, 87.7; Spirit of Warlord Teng at 35.7, 63.8 — who can drop Teng's Reach; and Kor'dok at 30.7, 58.6 — who can drop Vengeance of Kor'dok. All three are on Isle of Thunder island stage 1.

Summon and defeat all three Lightning Champions: Electromancer Ju'le at 44.5, 61.0 (island stage 1), Qj'nor at 48, 26 — who can drop Gaze of Qi'nor, and Ancient Mogu Guardian at 55.3, 47.9 — who can drop Mogu Sportsman's Bow.

Summon and defeat all three Primal Champions: Cera at 57.9, 79.2 (island stage 1) — who can drop Cera's Impalers; Windweaver Akil'amon at 68.9, 39.3 — who can drop Talonblade of Akil'amon; and the Incomplete Drakkari Colossus at 49.9, 20.7 — who can drop Drakkari Decapitator.