Trine, World Tremor, and Cosmic Tremor improve hero intelligence, agility, and strength. They are complex items, so sometimes, their crafting may be confusing. Here is a guide that may help clarify the matter.
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To craft a Trine, you need a Minotaur's Head, a Desert Blade, and a Hand of Glory.
Note
Each of these items consists of 20 fragments that you get in Campaign missions. Thus, you need 20 Minotaur's Head fragments to craft one Minotaur's Head item.
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To craft a World Tremor, you need a Minotaur's Head, a Trine (i.e., a Minotaur's Head, a Desert Blade, and a Hand of Glory), and a World Tremor Recipe.
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To craft a Cosmic Tremor, you need two World Tremors (i.e., two Minotaur's Heads, two Trines, and two World Tremor Recipes) and a Cosmic Tremor Recipe.
Note
Several heroes need these items for upgrading. Be careful when equipping an item and double-check if you are upgrading the desired hero.