This realm is protected by a great swarm of bats that attack all nonearthwalking champions, reducing their adjusted levels by half (rounded down).
Copyrights:
TSR
Wizards of the Coast
When a champion without the earthwalking ability attacks The Vampire's Realm his adjusted level is reduced by half. This includes cards played after the battle has begun, including allies played that have the earthwalking ability. This realms power target the champion, who must be the one with the earthwalking ability.
This is a good realm to have in the front rank of your formation, since few champions have the earthwalking ability.
This realms somewhat limited power makes it a tough choice for most decks, even Birthright world decks. If you can cause your opponent to attack this realm via Dimentional Door (100/PO) or similarly powered card, this realm becomes more useful. Even then there are better defensive realms to choose from.