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by how much is the time needed to finish a quest shortened when acquiring new grail horse?
Special Horses
Answer verified
That varies between each grail divine. It can be shortened by 100, 150, 200, 250, 300 or 800 (specific to Arthur) XP, the more XP are originally needed the more it's shortened per grail.
The number of XP it's shortened by with each additional grail is roughly 8% (after some slight rounding) of the original XP needed.