Just playing around with the Wake of the Ravager default party, I found what appears to be an obvious bug:

HP before:
Thy'Rokh: 82/74 (Aid had been used)
Gerakis: 132/165

After Gerakis used Lend Health on Thy'Rokh:
Thy'Rokh: 209/74 (!)
Gerakis: 5/165

This leads to the following hypotheses:
1. Lend Health can heal up to 127 HP. (Does Heal have this limit?)
2. If the target's HP is higher than its maximum, Lend Health will heal what the game thinks is a negative amount, which is then capped at 127. This ignores the target's maximum HP.

A screenshot of the party stats after the Lend Health use has been attached.

Further testing: With Thy'Rokh having 78/74 HP and Gerakis having 165/165 HP (thanks to Altruism, which works like Lend Health, including this bug), I was able to get Thy'Rokh to 238/74 HP, so the cap isn't 127.

With the help of Heal, one could easily get a character to have hundreds of current HP this way.

If you would prefer not to use exploits, here is a rule to follow: Do not use Lend Health or Altruism on any character whose HP is higher than their maximum.

It's actually even worse. Simply casting Aid followed by Cure Wounds spells will heal the character further above her normal maximum.

This bug does not exist (in the Aid+Cure form at least) in Shattered Lands. How did the programmers mess up something that was previously working?

Good question. Well it's possible they refactored healing for some of the higher level spells. Nice find though, we know that it's not a perfect superset of SL's spell engine.

Heal shouldn't have a limit on HP, though I haven't tested this yet. My Ravager save isn't too far. That 127 number (EDIT: the limit of a signed byte, hmm) might just be tied to the temporary HP, you might want to test just a normal transfer to another half-giant.

Actually, if you read the rest of my post, I was able to get a 160 HP transfer by healing the half-giant first. The 127 value I observed is simply a result of the minimum hp after Lend Health being 5 and
132 - 5 = 127.

There are some other little differences. For example, I noticed that the hammer created by Spiritual Hammer appears in the ranged weapon slot (does that make it ranged now?), and weapon creating spells no longer cause your *other* equipped weapons to be non-removable.

I am wondering what happens if you cast Heal on a character whose HP is above its maximum.

Ah ok. I haven't a good save to test with in Ravager. Will have to progress a little farther in it.