I already have it on my main account. I don't need the second account because I wouldn't use it anyway, so why waste it? Let it be useful to someone. :)

DLC
https://store.steampowered.com/app/527010/Tempest__Original_Soundtrack/
for game
https://store.steampowered.com/app/418180/Tempest_Pirate_Action_RPG/

I will not send the key without checking the winner has this DLC and base game.