Modify Assumptio skill

[dfabsgwapings]

Hi guys, I just wanted to know how to modify the assumptio skill. Like if the player wear a specific headgear the assumptio skill will be applied to the players within the 3x3 radius from the target of the assumptio skill. It doesnt matter whether the caster is on a party, guild or not.

 

It kinda similar to sanctuary. All players inside the radius of sactuary will be healed but this one all players within a 3x3 radius from the target will be buffed by assumptio.

 

Thanks in advance.