This monk studied the dragon's language and learned some elder secrets called Thu'um, this powers made them more powerful and some corrupted, the profane are exiled and thosse wo are true to the voice forget normal specch just to learn better thu'ums, but there is one, the Dragonspawn that he natural voice is made for that and he can speek this secrets easily without forget the normal speech. To learn a new word (spell), you can meditate with your monastery or someone or something that knows what you want.  This is obviously a Skyring reference

Whirlwind Sprint

In 3rd level when you chose this tradition, you learn how to control shouts an the first one the Whirlwind Sprint that gives you a dash using a thu'um that makes you travel 30 FT to a direction passing through enemies and allies as an action.

Learning

In 6th level you start your studies of a elder form of draconic, to better understanding of your shouts and and slowly learn how to learn languages mainly draconic

Learn a language

You already know draconic so to better learn the old version of it your master said you to practice learning a new language, making your study of a elder form of draconic faster. You learn a language of your choice.

Learn draconic.

In 6th level you start your studies of a elder form of draconic, to better understanding of your shouts and slowly learn the modern form. now you can speak draconic.

Spell casting

You learn your first shout by yourself in 6th level, you can choose between some spells to improve your combat ability.

Disarm

When you reach 11th level your masters fells a evolution on you and teach you a new shout, disarm opponents, and you noticed that the only way to learn agressive shouts is or asking to self defence or learning by yourself. Use a thu'um to make your opponent weapon fall to the ground once a day using a bonus action.

Dismay

At 17th level is teached for you the most feared shout, dismay, when used it makes all weaker creatures flee in terror and some of the strongest also dosen't resist the fear. Using a thu'um you can make enemies flee from you in terror. Roll 6d8, this number is the max HP of creatures that you can frighten (Like in the sleep magic).