dont worry about claw mastery, you only need it if you are gonna use chargeups. All damage comes from the boots and str/dex so claws are not so important.
Think about using a holy crafted weapon in the off hand and a claw with chance to cast amp damage in the main hand. mods from weapons like lifesteal etc do apply to kicks so you might wanna load up your main hand claw with skulls and off hand claw with ko runes to boost dex (adds damage and attack rating ftw).
Claw block works against spells too yes but it has no effect while moving, only when attacking or standing still (bad design since sins are supposed to be about moving around)
I wouldnt max claw block either, it has pretty bad deminishing returns. If it is your first char then maybe put 4-5 into it to help you more early game. + skills will buff it more than enough.
Death sentry will help you a ton with clearing trash mobs, I like to max it for huge range but thats up to you.
Maybe think about maxing shadow master to help you tank and take the heat off. Perhaps cloak of shadows for the huge def bonus, or dragon tail and tiger strike.
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