let injury = this.effect.itemTargets[0]
if (injury && this.effect.sourceTest.result.outcome == "success") {
 let days = new Roll(injury.system.duration.value).roll( {async: false} ).total
 let num = 1 + Number(this.effect.sourceTest.result.SL);
 let roll = await new Roll(num+'d10').roll({async: false})
 await roll.toMessage(this.script.getChatData())
 let newDays = Math.max(days - roll.total, 1)
 this.actor.updateEmbeddedDocuments("Item", [{_id: injury.id, 'system.duration.value': newDays} ])
 let message = "Injury reduces to "+newDays+" (-" + roll.total + ") instead of "+days
 this.script.scriptMessage(message)
}