Doubt about SCH attributes points.

[Tolmos]

Hello, as the tittle says, i have a doubt with that.
If a put all the points to MND, i'll have problems with MP in bosses fights ?
Also I don't understand why SCH is marked in party as PIE.
Any SCH doing high end content can give me a few tips for healing in high end bosses ?
Thank you so much!

Don't save Aetherflow unless you are at 100% mana. Even if you are only down 5%, use it the second it comes up. Do this and you'll never OOM, even when you go nuts on heals.