So your characters have reached level 20. They've gone and fought just about all they can fight. They've saved the world probably a couple times over. It's time to hang up the sword and lute and retire, right? Not so fast, adventurer! Your story doesn't have to end at level 20. 2CGaming is running a Kickstarter campaign for an Epic Legacy supplement book to 5th Edition that lets you take your characters on up to level 30.
The book expands on the 12 core character classes, bringing them up to level 30. There's new abilities, new spells, new equipment, and all that sort of good stuff to provide your characters all the epic stats that are befitting characters of that level. Of course, if the characters are growing, the threats against them need to as well. That's why the book also provides stats for nefarious monsters and epic enemies to fight against as well.
The campaign is up and running now with still 16 days left to go.