What's the spell/ability?

[Stevespears 0]

I'm seeing players.usimg a magic spell it sends a what looks like a air spell to and back from multiple targets anyone tell me what this is there's a star with a arrow pointing to bottom left and bottom right aswell. Cheers

[Sobend 918]

What you're actually seeing is a level 92 ancient curse called soulsplit.  To use it, you need to have level 92 prayer and have the Temple at Senntisten quest completed.  It is used to heal a player for a certain percentage of the damage dealt to the target.  A player using soulsplit has an overhead prayer with the icon you describe.