I like how Harry actually made two journeys in this story: one on holiday, and the other, one of personal discovery, and I especially like how you didn't wrap the ending up tight, but like Harry's life now, anything could happen. The ritual was breathtaking, and the fact that this Snape would do it as matter of course, made perfect sense in your story.
Wonderful use of your prompts; and I adored your goblins!