About Seraph

Well Im just confuse about seraphs nowadays because maybe im just "believing"myself that a seraph is an int type character but why do many players here in mazey says that a seraph must undergo str type?I know that seraphs buffs depends on int(especially the buff duration)

seraph go strength type because they are use for hunting boss/dungeons..they are good at hunting because they can buff themselves alone..i think only the geburah is the Int dependent skill because the other seraph skills have a time limit of 15mins when used

Thanks for the answer