The Lock Card
The lock card takes the form of a green and gold lock that isn't too large.
It's powers are as its name applies, to put locks on something and lock
it up. It attacked the whole clow card group by locking them in a vault.
Sakura could undo it with her key of clow but Lock's will kept the key
from undoing the lock. Li managed to help by blocking Lock's power with
an ofuda.
Lock has the ability to both create locks or remove them as well as
lock things up whenever it is summoned from the clow card. Want to keep
someone out of your room? Well it's not a problem anymore!
