Learning how to properly play AST

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Your card spread is done around the person you have on target
Or around you if you're targeting a monster or nothing

Do you know if it's 15y? Or is it one of those crazy 6y? I feel like it's almost 6 since I can do Asp. Helios and usually hit all but maybe the tank if he's just out of range. But seems like royal road expanded is more narrow.