The wisdom stat as it is described in character creation doesn't exist in game, it's probably a left over from a beta build (I wasn't in beta so don't know).  As it stands now the wisdom stat is starting essence.  15 wisdom = 15 essence at start, 5 wis = 5 essence.

You can perform every action with 0.000001 action points.

Actually there have been times when I have had 0.1 action points, but it would not let me cast a spell because it says it requires 2 action points (even though I can cast a spell with 0.5 action points just fine).