Duolingo wants to expand your High Valyrian ahead of 'House of the Dragon'

It's been far too long since our last visit to good ol' Westeros, but the wait is nearly over.

In roughly a month's time, HBO launches House of the Dragon, the Game of Thrones prequel set 200 years before events of A Song of Ice and Fire during the Targaryen civil war.

So what better way to kill time until then than by...