[RPG] How do brutal and high crit weapons interact with non [W] damaging attack powers

1. No the extra 2d6 are not brutal. Dice granted via a magic weapon are not [W] damage, but extra dice.
2. Yes, the extra dice granted by high-crit are brutal as they are specifically [W] damage.

From the Adventurer's Vault FAQ

I am wielding a magic weapon with brutal 2. If I roll a critical hit, do I get to re-roll 1s and 2s when I roll for the bonus damage?

No, the brutal weapon trait only applies to rolls for normal weapon damage, signified by [W]. The bonus damage for critical hits does not qualify for this. However, because high crit adds a [W] roll (or 2[W] or 3[W] depending on your level), you would get to re-roll any 1s or 2s.

Ok, to answer your bullets in order:

1. Sort of, but not really. When you use your axe as your implement for your monk powers, you would add any properties related to the axe (such as the enhancement bonus), and any crit effects from the enchantment (usually 1d6 per plus, but often other things. However, brutal and high-crit only apply to [W] dice. Implement powers never use the [W] dice and instead use stated damage expressions (like 2d8 or 1d6). So while you get the enhancement and crit effects from the enchantment you don't get the effects that affect weapon dice (similar to how you don't get the proficiency bonus when you use it as an implement).

   Essentially, when you use an item as a weapon, all of the weapon properties apply (weapon damage dice, brutal, high crit, reach etc). However, when you use a weapon as an implement, only the enchantment applies. The only real difference between your executioner's axe and a long sword, or even a heavy crossbow in this case is what enchantments can be applied to them. (HT Oblivious Sage there).

2. They are different item slots, but the bonuses are the same and do not stack. The +1 from a Ki focus is an enhancement bonus, the +2 from the weapon is also an enhancement bonus. To answer your bullets directly

   • No. You only get one or the other, not both.
   • You can use the weapon, but you only get +2, the proficiency bonus only counts on Weapon powers. (Note: weapon power via the Ki focus gets the proficiency from the Axe as well)

   • Yes, you can use it as an implement if it's an implement power. Pay attention to the power's keywords, some powers are Weapon and some powers are Implement, this matters greatly as it determines whether or not you get to add the proficiency bonus.

   • To address the parenthetical, this is kind of actually complicated. It depends heavily on the power. If the power requires a one handed weapon, you need a one handed weapon. If it doesn't say, then no. However, note that to use your monk unarmed strike, you must have a hand free, so you can't do that while wielding your executioner's axe (talk to your DM though, you might be able to hold it in one hand and strike unarmed...whether you can or not is touchy).

3. Is the Flurry of Blows a weapon or implement power? If yes, then you get the enhancement bonus, if no, then you don't. If it's a weapon power you get the proficiency bonus, if its an implement power, then you don't (It's neither, it doesn't even have a to-hit roll...if it were a weapon or implement power, you'd be able to add the enhancement bonus to the damage, but it's not so that's moot).