I’ve been grinding for a three star attack % boot now for two days,I’ve used close to 1500 energy doing it,I’ve had every conceivable outcome except the one I need,surely drop rates for challenge should be better than this,it’s rediculous,I can’t move on with the challenge so I can get the tome and move on to next set of challenges...... what else can I do I tried to contact support but got a generic response to come on here