[QUOTE=icke;1646588]What does that mean, "HPs to be restored"? Do You mean all hit points missing to full health or the number of hit points the spell would normally restore? In any way, the heal checks are enormous: healing 25 missing hit points with a cure critical wound spell at level 7(<4d8+9>=25) requires a 31 check result - with a 10 + WIS bonus.
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Yah that's not real clear (edited orginal post for clarity). The way it works is you roll a heal check + the level of the heal spell you cast. For every 1 point above 10 your heal spell heals.

So if you're an adept and you cast cure critical wounds you make two rolls. First the healing spell: 4d8+12 (say 33 points) and then a heal check.

For every 1 point above 10 that you make on the heal check your spell would heal a point of damage up to a max of 33 (the number you rolled on the spell). Those hit points would be evenly restored over a 24 hour period.

The idea is instant healing doesn't mesh well with low magic but you also don't want your PCs out of commission for to long inbetween fights. This option lets you speed that process up with out having instant healing.