you didn’t specify which trolls, so i’m going to answer these with the best trolls that i think fit the question (also bc i’m a lil lazy and just woke up)
Violet Potion: …the obsession that’s going to lead to their downfall.
for herkul, it’s definitely his feeling that he’s above the law, above any sort of punishment from anyone, and his obsession with trying to “fix” people. when he gets desperate to retain control, he gets sloppy.
as for galina, it’s her naivety. she wants so badly to make friends that she doesn’t see when it could be harmful to her. in a non-herkul knowing timeline, it’s her faith; she’s willing to do anything to connect with the messiahs, and that can lead to some serious consequences.
Gold Potion: …a skill they wish they had, and a skill they couldn’t care less about having.
tulpaz wishes that she had something like super strength or psionics that would help her out on the battlefield. a skill she has that she doesn’t give a shit about is her knot tying. when she’s bored and there’s nothing around to destroy, she likes to find rope or string and tie intricate knots. it’s pretty useless, aside from making things to add to her weapons so others can identify them better.