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Kieran's expression shifted slightly once he saw the notification involving a sub-quest. However, that was understandable because receiving a sub-quest was a rare occurrence. Only circumstances that weren't accounted for beforehand could spur a sub-quest. In short, it was an attachment to an already existing quest in a player's possession.
However, aside from the one aspect of the main quest that triggered the event, these sub-quests usually carried unique rewards.
While a sub quest was quite fascinating, it wasn't the entire reason for Kieran's shock. His astonishment came from the rank affixed to the sub-quest—SSS. Generally, sub-quests only carried a fraction of the main quest's difficulty because it was only linked to one part of the existing quest.
Yet, the quest forcibly handed to Kieran was the same rank as the main one!