Gravira is a magic spell in Final Fantasy VII Rebirth. It is granted by the 
Gravity Materia, and is the mid-level gravity spell below 
Gravity and above Graviga. Gravity inflicts 50% of an enemy's maximum HP as fractional damage.
Use[]
Gravity can be cast when a level 2 gravity materia is equipped. The spell deals damage based on the percentage of an enemy's max HP, and is guaranteed to hit. This means the spell's damage is based not on the caster's 
Magic Attack, but on their MP pool and on the enemy's resistance to it, and the 9,999 damage limit unless broken with the Genji Gloves.
Very few 
Support Materia can amplify Gravira. Magic Efficiency Materia is most effective in reducing its prohibitive MP cost.
Tough enemies are typically immune to fractional damage, limiting Gravira's use cases further. The player can use Assess to determine the enemy's susceptibility to avoid wasting MP.