Tempering stone

Greetings
I propose to add drop additional tempering stones 175> 190

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My experience
Source: Exalted Dagger +21
Boost: Event server buff, Tempering charm, Fracture Alchemist set, Tempering talisman, Tempering boost potion.
Temperiong stone: 170

Chance: Very low

10x Fail = 250 Elluns fail....