Blood Weapon / other DRK suggestions:

[MagiusNecros]

Sole Survivor is useful but no matter how you butter it up it's still a situational skill that entirely relies on a single unit dying within 15 seconds from anything.

Helpful in FATE farms, excellent but limited in it's use in dungeon runs(enemy about to die then use it), and based on raid completion times and if an add is there to die you'll only use it about 5-7 times with that 2 minute cooldown. Maybe more if it lasts longer then 15 minutes.

SoSu is just really a power word to the party to kill the one enemy quickly to essentially give the DRK a mercy stroke buff. Meanwhile at 58 the PLD and WAR get rewarded with a bonus that is guaranteed and on lower cooldowns. PLD gets a lot of HP back or even on a party member and themselves, WAR can choose between HP/TP and DRK has to work for a possible HP+MP restore and fail to kill thing in 15 seconds you just wasted your 58 skill for nothing.

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You turn off Grit for more damage when you know/trust your healer can heal you through the damage only relying on your base defensive abilities. Or you can blind and Dark Dance mobs and not worry about taking that much damage at all. After all 100% of all damage is mitigated if something is dead or can't hit you.