The website is pretty vague about how much Spirit Summoning lore effects your ability to land in the 'correct' spot.

Has anyone done any research in to this?

I ask because I have a character with a large amount of Spirit Summoning lore (over 90 ranks), and I routinely seem to 'miss' the 'correct' landing spot.

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It's amazing what people will do when they think you can't see them.