OK so I finally just completed the main Thieves Guild Quest... awesome stuff!! Now, in your opinion, which NightInGale Agent power in the best?

Agent of Shadow?
Agent of Subterfuge?
Agent of Strife?


None of my sneak skills are particularly high. But I went ahead and picked Subterfuge just for the jell of because it sounds fun.

Also, regarding Agent of Shadow....according to the wiki it allows you "to be invisible for 2 minutes while sneaking."....now, does this mean I can sneak during a fight, and actually remain invisible to all or most enemies while wacking them to death?

I chose strife because on my assassin most of my level up choices were for stamina (I like hoarding stuff lol). The instant 100 life drain is pretty sweet, especially against really tough enemies I fail to get the jump on. As far as agent of shadow goes I highly doubt it works that way

Agent of Shadow is good if you have the last perk on the sneak tree.

With this you can't be invisible when you're sneaking and NOT detected.

It permits you to stab multiple times a single enemy.

is it true that these can only be use once a day?

I chose subterfuge on accident and never went back to the nightingale hall to change my choice.