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Assassins get +3 health per point in Vitality, meaning by the end of Hell (clvl 84) you'll most likely have over 1000 health with some bonuses from items. You can focus the rest of your points into Vitality. Once your Strength and Dexterity reach 120, that's it for them. Ideally, you should increase your Strength, Dexterity and Vitality at the same rate (5 each per 3 levels) since that will be keeping your Attack Rating, Strength Requirement for armors, Strength and Dexterity Requirement for Claws and health amount constantly on par with the increasing difficulty and better item drops. Therefore, Strength and Dexterity will only be getting as many points as they really need to use the best Claws available (Scissors Suwayyah requires 118 Strength and Dextereity).
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Her lack of shields also means a disadvantage in armor rating compared to shield wielders like the paladins and as a result, the Tiger Claw Sin will be taking hits quite often when she's attacked (which won't be all that often really). While this means Dexterity will not be that important for a Tiger Claw Sin and she will be able to put more points into Vitality, it also means she will never reach 75% chance to block. This build will use double Claws at all times, meaning block rate will be determined solely by Weapon Block and not Dexterity. Since Tiger Claw Sin is a strictly melee build, it is necessary to dedicate as many points as possible into Vitality.
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