I'm looking for canons in any media where male character A, of a high social class, is designated a hero and has to go on a long journey or perform an extremely dangerous task for reasons not totally within his own control. He is accompanied/aided by male character B who is of a lower social class and is devoted to A to the point of disregarding his own safety on numerous occasions. The stress of the task, or associated supernatural factors, mean that A is either self-destructive, horrible to B, totally out of it, a danger to everyone around him, or all of these things. Bonus if at least one of them dies at the end.