Scale Spikes

Transmutation
Level: Alchemist* 2, Artificer * 2, Bloodrager * 2, Druid * 2, Hunter * 2, Ranger * 2, Shaman * 2, Sorcerer */Wizard * 2, Warlock * 2
Components: V, S, M/DF (a small thorn)
Casting Time: 1 Standard Action
Range: close (25 ft. + 5 ft./2 levels)
Target: one living creature/level that is a reptile, has the dragon type, or has the reptilian subtype, and that also has a natural armor bonus of at least +1
Duration: 1 minute/level
Saving Throw: Fortitude negates (harmless)
Spell Resistance: yes (harmless)
  When the target is affected by this spell, its scales grow jagged spikes. These spikes act like +1 armor spikes. The subject is automatically considered proficient with these scale spikes.