Barfrost (status)

NulFrost, also known as Barfrost, Barblizzard, NulIce, and AICE, is a recurring status effect that protects against Ice damage. It is most often granted by the NulFrost spell.

Final Fantasy
NulFrost reduces Ice-elemental damage inflicted on all allies by half. It can only be imparted by use of the NulFrost spell.

Final Fantasy X
NulFrost negates one Ice-elemental attack or spell. Armors can be customized with SOS NulFrost, which will cast NulFrost when reaching critical HP status. It can also be bestowed by the NulFrost spell. The status is represented by a glowing white ball which orbits around the person it is affecting.

Final Fantasy XI
Barblizzard increases a character's resistance to Ice, decreasing the damage taken from Ice-based elemental spells and attacks.

Final Fantasy XIII
Barfrost is granted by the Synergist's Barfrost spell. It increases resistance against Ice-elemental attacks.