Meeble Burrows... why 20 hours?

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Wait u have to go trade that damn grimore every 20hrs to get a pheromone? Npc doesn't jus give u them at once after theyve accumulated?

Think it works like this: you can hold a KI by trading the grimoire. The NPC can hold four for you. So five total. He will also hold your grimoire for you while you have a KI. Kind of like the way assault tags work.