BASON
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Why would a thief need to fight? He's weak in combat, and the developers took that into account. What's the point of him starting to level up after being stealthy for 5 turns? None! Why would he need to kill, for example, neutral creatures guarding mines that could continue to protect YOUR property? This trick isn't the most original, but it shows that you shouldn't primarily focus on killing, and therefore further leveling up is unnecessary.