Say, for example, I'm a drow or a tiefling. I have the *darkness* spell once a day. However, I'm a warlock with Devil's Sight and I want as many chances to cast *darkness* as possible. Can I take *darkness* as a warlock spell as well, or can I only take it once as a racial spell?

Because I can't use slots to cast the racial spell ([If you have the ability to cast a spell without a spell slot can you cast that spell using a spell slot?](https://rpg.stackexchange.com/questions/102875/if-you-have-the-ability-to-cast-a-spell-without-a-spell-slot-can-you-cast-that-s)), I can't do that for extra uses. So could I, in that example, take *darkness* again or am I stuck with only the racial ability?