You cannot 'target skull' but you can have each character pre-focus one mob (with a multiplexer you can have the main target, then slave. Then they just /cast [@focus, nodead, harm] hex or whatever you want.
/assist #master#
/focus /script SetRaidTarget(“focus”,8)
0 = no icon
1 = Yellow 4-point Star
2 = Orange Circle
3 = Purple Diamond
4 = Green Triangle
5 = White Crescent Moon
6 = Blue Square
7 = Red “X” Cross
8 = White Skull
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