Constellation Seal (星座封印, Seizo Fuuin) is a keyword which debuted in BS38. This keyword is not restricted to any particular color, but notably, it is the only one exclusive to Nexuses. This keyword also occurs only on the Nexus cards that were remade as Revival cards in BS38. Nexuses with this keyword have the following text:
- Constellation Seal (When Deployed) Send (Soul Core) from your Spirit in family "Galaxian"/"Astral Soul" to your Life.
This effect allows the player to make use of Seal without the need of Spirits with Seal. Of course, the keyword's name is a reference to the Constellation Saga.