What spells can't be used inside of Bosses Rooms?
Today me friends and I made our rotation of bosses as normaly normally we do and we realized that for example the EK's can't use Chivalrous Challenge (exeta amp res), however I could use the spells Sap Strength (exori kor) and Expose Weakness (exori moe). This make me wonder: First Why Chivalrous Challenge can't be use inside bosses room room and What others spells can't be used inside bosses room?
Thanks in advance.