*I tested these combos against Corrin in training mode, so no DI, no rage.
Between 70 until around 105%, a dthrow at the ledge (so the opponent's feet don't touch the ground) to DJ dair is true with no DI and it kills depending on the opposing character. I guess most people well DI in, so it works. You can also read an airdodge and punish it with dair or onslaught.
Also, if you manage to hit only the first hit fair when the opponent is grounded and next to the ledge, it combos into dair between 80 and 110%. Both sweetspot and sourspot kills. Past these %s, you need to DJ dair in order to hit. Surprisingly it works until around 160% (!). Also, first hit fair to sweetspot nair kills between 130% and 165%.
The same goes for falling uair. It combos into dair between 90 and 130%, and falling uair to sweetspot nair kills between 115 and 140%.
And to finish, if you are good with footstools and jab lock combos, 1111 has a 0 to death where you suicide with your opponent. Give it a look:
https://www.youtube.com/watch?v=ChR6dkEfDU0
Some characters can survive if they have a very high vertical recovery.
I plain to do a 1111 combo guide, and that's some stuff I've got so far.