You can purchase ranks for the server here. Ranks give you extra abilities and perks in-game. The specific details for what you receive for each rank are listed on each package. 

The ranks are permanent. They will never expire.

Vip Rank (PERM)

Hero Rank (PERM)

Knight Rank (PERM)

God Rank (PERM)

Premium Rank (PERM)

Titan Rank (PERM)