Dragonrider

Tame and ride 5 dragons - a Dragonborn feature. After defeating Miraak you can learn the Bend Will shout (its three words are taught during the Dragonborn main quest at the Word Wall on the Summit / from Hermaeus Mora). Fully-worded Bend Will lets you shout at a landed dragon to tame and ride it. Do that to 5 different dragons across your travels.