Daenerys sends her three bloodriders, Rakharo, Kovarro, and Aggo to ride away until they find a city or the sea.
In the books
In the A Song of Ice and Fire novels, the title of bloodrider carries great prestige within a khalasar. Bloodriders seat next to the Khal in feasts and ceremonies. They may also share the Khal's wife, but never his horse. A bloodrider may also be a ko, commanding a subdivision of the khalasar.
If a khal is killed, bloodriders are expected to avenge him. Once done, their last service is to escort the Khaleesi to Vaes Dothrak to join the Dosh khaleen. Then they are to join the khal in death.