Added $player_x, $player_y, $player_z, $boss_x, $boss_y, $boss_z, and
$world variables to the command skill. Coordinate variables can also
have a random offset using %, such as $boss_x%5.

These can be used to execute commands for other plugins that target
coordinates. For example, combined with the plugin MagicSpells, you
could have a skill such as:
- cmd 'cast lightning $world,$boss_x%10,$boss_y,$boss_z%10' <200 1

This will cause the boss to cast the Lightning spell at a random
location within 10 blocks (x,z) of the boss.