From Goblin Rank to Phantom Rank
[Restriction: Must already be Goblin rank to purchase this item]
From Phantom Rank to Scythe Rank
[Restriction: Must already be Phantom rank to purchase this item]
From Scythe Rank to Grimreaper Rank
[Restriction: Must already be Scythe rank to purchase this item]
From Grimreaper Rank to Necromancer Rank
[Restriction: Must already be Grimreaper rank to purchase this item]