Dovahkiin (5e Subrace)
From D&D Wiki
An exceedingly-rare birth occurrence, known in its native tongue as "Dragonborn" (no relation to the race of the same name), that emerges from Humans, Elves, Dwarves, Orcs, Hobgoblins, Halflings, Gnomes, and Lizardfolk.
NOTE: While you may select this subrace at character creation, the DM may choose to grant this subrace and all associated features to you in game progression; if so, this subrace may stack with another, such as that of a Drow Elf or Hill Dwarf.
Ability Score Increase. You gain three points to spend in unique statistics of your choice, but must subtract 2 points from an additional statistic.
Activation. To apply these attributes (and remove your -2 statistic penalty chosen above), you must first learn you are 'Dovahkiin' through some great feat (determined by the DM; typically by landing the killing blow to a powerful creature).
Draconic. Can speak, read, and write the Draconic language. Additionally, your charisma checks with Dragons or creatures that speak Draconic are made with advantage.
Thu'um. You may use any Dragon Shouts you know as an action or bonus action. After using your shout, at the beginning of your turns, roll a d10. On rolls of 9-10, you may use your shouts again. A number of times per day equal to half your proficiency bonus (rounded down), if you personally encounter any Thu'um words being used by Dragon or Dragon-associated entities, you may use a DC 18 Insight check as a reaction; on success, you learn the word used.
Spellcasting. You know the Thunderwave spell and may cast it once at level equal to your proficiency bonus without using a spell slot, using Constitution as your spellcasting statistic. You regain the ability to use it after finishing a short or long rest.