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Shin followed Diablo as they sneaked inside the Corrupted Nest. His stealth abilities were inferior to the latter due to their class differences and advantages, but his technique was still quite good.
His training to move stealthily was still there, so sneaking like this would not be a problem, especially when his skills were enhanced by his secondary combative class and his sacred relic cloak, the [Death's Shadow].
By following Diablo, Shin was able to get a glimpse of the assassin's technique. They were quite crude and simple when compared to most of the people in the same field, but his self-studied and self-created techniques were one of the best. Adding the stealth skills and abilities that he had gotten from the game, his was still better than most of the players with the same or similar class as he had created them himself.
He was more familiar with all of these, making his control over everything reached a certain level.