Lengthened Incantation

You lengthen the time it takes to cast your next Spell to empower it. You may add 2 AP to the cost of your next spell with the Spell gaining additional Light Damage on it. If you cannot pay this AP cost this turn, the Spell also gains the Setup keyword.

If the Spell has multiple attack rolls or different damage rolls, this bonus only applies to one of them.

However, if the spell is a Scattering AoE spell then the bonus damage applies to all targets of that spell. If that Scattering spell hits a target more than once it only applies to one damage roll. If the spell lasts for multiple turns, it only applies to the initial casting.