Why Vampire Shield: That is because Vampire Shield has an additional stat: HP+20%, Speed+15% - This is best shield equipment for Seraph Job Classes for Tanking.
Back to the question: How to get a Vampire Shield? The answer is by joining the Insanity Rainbow Race. The Vampire Shield is an Event Rewards item. This means it can't be traded.
The percentage of getting a Vampire Shield is pretty high. Just make sure you complete the mini-games in the Rainbow Race to receive the reward boxes.
