The fire affinity is associated with lava, explosions and the Nether. Fire components are usually offensive ones, like Fire Damage, Ignition or Explosion.
Fire Resistance
After using fire spells for some time, you develop some resistance to fire. As you delve deeper, you notice the resistance getting stronger and stronger.
Affinity: Fire
Range: 1 - 100 %%
Damage in Water
Having fun with fire magic has made you less suitable for water. You will take damage in water, though not enough to kill you on its own.
Affinity: Fire
Range: 50 - 100 %%
Fire Punch
Becoming part fire, enemies you hit now get set on fire.
Affinity: Fire
Range: 100 %%