Shellra

Shellra is a spell that exists in Final Fantasy XI and Final Fantasy XIII.

Final Fantasy XI
Shellra is a White Magic spell that provides the effect of Shell to all party members within range. It is learnt by White Mages at level 17. The spell takes 3 seconds and 18 MP to cast. It may be used once every 15 seconds. Several upgraded versions are also available.

Final Fantasy XIII
Shellra is a Synergist's spell which increases resistance to magical damage and healing by 50%. Its effect duration is shorter than Shell's. It can be learnt by Oerba Dia Vanille at stage 9 and by Oerba Yun Fang at stage 7.