Purple Materia Power
These materia increase their static bonuses as they level. Some provide an increase in bonus at every level; others only provide increases at 3rd/5th level.
Skill Boost: Provides 3/6/10 to a skill
Ability Boost: Provides 2/4/6 to one ability score.
Fleet: Provides 5/10/15/20/30 to movement speed.
Hardy: Provides 1/2/3 x character level in extra hit points.
Stoneskin: Provides 1/2/3/4/5 natural armor bonus to AC.
Resistant: Provides 1/2/3/4/5 resistance bonus to saves.
Deflect: Provides 1/2/3/4/5 deflection bonus to AC.