Board Thread:Character Discussion/@comment-26340222-20151116200610

Was just thinking but, since Merlin has stated Immortality has exceptions, including a Dark One being able to kill him, does this mean the following are true as well?

1. Merlin has the potential to kill Emma and Hook (As the DO)

2. Hook can kill Emma (and vice versa) without the need of the dagger (now Excalibur)?

I ask because Emma, Hook and Merlin are all essentially immortal because they all have the power of the Grail inside them. 