I had thought about ways to abuse this with sleep as soon as I read orb mastery. Still though I'm not sure if it's that bad, at least at low level.
Going for a 20 wisdom seems insane. You end up with a 14 int and a 10 con. Your sleep spell does have the potential to maybe end a solo fight (but not very often) but you suck in every other way. At level 1 you will have 12 AC, 20 hitpoints and be +2 to hit and damage. Even with action surge your sleep misses about half the time, and your -5 on saves only cancels the bosses +5 so he wakes up 55% of time. Once your sleep has been cast your completely useless. You will also be easily hit by almost anything and go down very fast.
The more reasonable 18 int, 16 wis build is far stronger. You are actually still quite effective when your not casting sleep and your sleep is still quite brutal. Still only -3 on saves though (spel focus is a paragon feat) so your unlikely to take down a solo.
The main issue I can see is that sleep scales a bit too well and may be a little too good when cast by say a demi-god with orb focus. This is something I will worry about if iI ever play in a campaign with demi-gods.
Going for a 20 wisdom seems insane. You end up with a 14 int and a 10 con. Your sleep spell does have the potential to maybe end a solo fight (but not very often) but you suck in every other way. At level 1 you will have 12 AC, 20 hitpoints and be +2 to hit and damage. Even with action surge your sleep misses about half the time, and your -5 on saves only cancels the bosses +5 so he wakes up 55% of time. Once your sleep has been cast your completely useless. You will also be easily hit by almost anything and go down very fast.
The more reasonable 18 int, 16 wis build is far stronger. You are actually still quite effective when your not casting sleep and your sleep is still quite brutal. Still only -3 on saves though (spel focus is a paragon feat) so your unlikely to take down a solo.
The main issue I can see is that sleep scales a bit too well and may be a little too good when cast by say a demi-god with orb focus. This is something I will worry about if iI ever play in a campaign with demi-gods.