Both. I had to know how to summon them to program the summoning circles in, though a few demons can just be done by general 'family'.
But then there's Loki, who I've known for at least a thousand years, and he's a jotunn. Which aren't 'technically' trolls depending on who you ask, and if you ask Loki anything he gives you five different answers.
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But then there's Loki, who I've known for at least a thousand years, and he's a jotunn. Which aren't 'technically' trolls depending on who you ask, and if you ask Loki anything he gives you five different answers.