Phantom SP Build.

'Move on'. You have the answer to your damn question.

Would you recommend Meso Guard to be stolen/used at bossed that can 1/1? Relying on pet pots to save me in 1/1 situations doesn't always work out, but my shad never died when it happens due to MG.

I would use power guard, as I mentioned to Danny and Joe when we we're playing Phantom, they're essentially the same, except Power Guard doesn't cost you mesos.

Yes, thieves have high avoid, but damage reduction buffs are invaluable when you don't avoid, especially in maps with pot cooldown. Better safe than dead.

And, [MENTION=87]Devil[/MENTION]; it depends on the buff, really, but Moon Light and Mental Clarity have stacked for me. Well, there's buffs that stack and buffs that don't, for example bless stacks, but until the warrior revamp after Mikhail, Rage doesn't, but you can use Bless and Rage because Bless can stack, but if you use Karma, it'll cancel out rage because neither rage or karma are stacking buffs. I'm pretty sure Mental Clarity is like Karma, so in your example, you could combine Moonlight and Dark Serenity with either Rage or Mental Clarity.