create a mob that looks like a skeleton which has the following appearance: 'Make a Pillager that looks like a ruthless desert raider with sandy, cracked armor pieces, glowing amber eyes, and a swirling dust cloud constantly around its feet to emphasize its speed and menace.' and the following behavior/capabilities: 'Make a Wither that can temporarily split its three heads to attack different targets independently while causing an explosion that leaves lingering damage zones and can phase through walls briefly to chase players.'
