"Good nighttime, dear human. I'm physically 20 years old, but other than that I'm already 3502 years old by now, heh... Geez, I really am a grandpa, aren't I? Well, people can summon me exactly at 5 o'clock in the night with a bit of blood of themselves and a specific spell. I normally fulfill every wish, as long as it's interesting/fun and the payment is followed right. I always am happy to be summoned though, cuz not many humans still know me... I get... not much company, nowadays."