Upon level-up, it would be nice for a server to have configurable custom level-up messages aside from the default "You've leveled up to Level x!"

Maybe it could support using the guild's custom emojis. It could also use a few placeholders to display some values that vary. Some proposals:

• %l : the user's level
• %d : level-up date
• %t : level-up time

Of course, it doesn't have to use the percent (%) prefix. I'm not sure what the best practices are, regarding this topic. Whichever format would be most appropriate should be used.