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http://media.comicvine.com/uploads/1/15659/1765250-prism_vs_angon_large.jpg

vs

http://media.comicvine.com/uploads/0/1790/1492891-electro_large.jpg

What can Prism do except probably breaking light?

Don't know much, but here is a list from comicvine

Prism could absorb light and certain forms of energy, and release them for various effects, which being a genius scientist specializing in the study of light he was particularly well-suited for. These effects include:

Invisibility
Prism could bend light around himself to become invisible.

Holographic Projection
Prism once demonstrated the ability to create a large number of illusionary duplicates of himself. Strangely, sound was shown to come out of the illusion's mouths as well. Whether he could apply this ability to other objects was never explored.

Energy Projection
Prism was able to fire triangular beams from his hands and eyes fueled by the light he absorbed. He described these as "laser beams" and "infrared beams" and he primarily fired them from his hands and eyes. His Infrared Beam seemed to work as a form of targeted pyrokinesis as he was able to look at and heat up a person or object by looking at it.

Super Strength
In addition to his light-manipulation abilities, Prism's body seems to grant him strength sufficient to injure Loose Cannon, and completely destroy a door with a single punch.

Invulnerability
His crystal body is also strong enough to survive several explosions occurring right in front of him, blasts of electricity -which he's completely immune to- the punch of Loose Cannon, and blade projectiles fired at high speed.

Marksmanship
In addition to his powers, prior to becoming Prism, Powell stated he had nightly target practice firing his energy weapon at Eclipso bats.

Originally posted by Prep-Man
Invulnerability
His crystal body is also strong enough to survive several explosions occurring right in front of him, blasts of electricity -which he's completely immune to- the punch of Loose Cannon, and blade projectiles fired at high speed. Spite thread eh?

Yeah, I didn't read his whole bio.