That Old Black Magic

Gwen has her first encounter with Morgana when Merlin's nemesis kidnaps Tasha in an effort to force Gwen to help her secure the ultimate prize: Merlin's Stone, an ancient crystal that holds the key to immortality. The rift between Gwen and Josh begins to mend as the two unite to save Tasha - and defeat Morgana. Merlin endows Gwen with a special gift: a talisman that belonged to Guinevere, and which will help Gwen to focus her power.