This simple mod adds two entities that fight eachother! 

you can use this mod to make areas for the blue and red guys to fight.

Red

The red one looks like player but is completly red, It has 20 hp and deals a little bit of damge

It also has its own block called "red block"

Blue

Same as the red one, It looks like a player but completly blue. It also has 20 hp and deals a little bit of damage.

it also has its own block called "blue block"

There are two commands:
/destroy (kills all items on the floor and red and blue guys)

/destroyexeptitem (kills all red and blue guy but not items)