Carranam refers to a bond between two Fae . (Comes from Sarah J. Maas' novel ,,Throne of
Glass")
It allows the Fae to share their magic, which is a strong advantage in battle, and to communicate almost telepathically.
Carranam is derived from the Gaelic Mon aram cara which translates roughly to '
soulmate'
(via 'Throne of
Glass Wiki')