Erosion is an alien in Tommy 12 and also Jace. He is the combined form of Thin Air and Rock Solid.
- His head is made of ice.
- His shoulders are made of rock.
- His tail is made of air.
- His right arm is made of sand.
- His left leg is made of sand.
- His right leg is made of ice.
- His eyes are made of air.
- His left arm is made of ice.
- His chest is made of rock.
- His waist is made of sand.
- His fists are made of air.
- His neck is made of water.
- Changing his shape
- Detaching his head from his body
- Breathing in water
- Earth manipulation
- He can't breath in space
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