Knight Defensive Skills: Now as for the other knight skills...basically a knight is a tank, and in this game tanking is bad. But still a passive 15% Mabinogi Gold block rate doesn't hurt so max shield mastery as it gives you a decent def boost as well.
Parry further boost your block rate by 17% so yea go ahead and max, do note how ever the 30 seconds duration so its use is limited to boss room/pvp situations. Max the passive asp, the buff at your leisure.
Next up we have two buffs which IMO is crap, 1st off the def boost from increased defense is only a measly 180, once again tanking is bad I’d rather avoid getting hit then having more defense for the sake of taking hits, so learn to dodge and dodge well.
2ndly the bottle skill (giant growth), you drop huge amounts of mp for 2.1k hp, sounds good right? Then again that additional hp only affects maxed hp and you need an aco to heal the remainder, pvp wise same argument, also note it takes forever to cast this buff...by which time an assasin would have you at half hp.
Body activation, one of the best passive skills in the game, but still...you need the level to prove this skill so getting it right away may not be a good idea.