Upgrade Nebula Stone

Upgrade Nebula Stone is a special event item that decreases the amount of materials used to upgrade weapons.

May 11 to June 1, 2016

 * Purchasable from the event tab of Dragon Express with 60  as part of the Vipercap Gauntlet Event
 * Usable until June 22, 2016

May 11 to June 1, 2016

 * Reduces the cost of weapon transformation when used, up to 40% for lower tiers
 * Used in the Offering slot in place of an transformation weapon
 * Does not reduce the cost of a Breakthrough or weapon reinforcement (only the standard transformation levels)
 * Reduced potency at higher weapon paths - see table for reduction in materials
 * Was used to encourage people to upgrade their weapons before the Siren weapon path was removed