StigiBengBeng
Neophyte III
Heritage has old implementation of Magic Reflection, in Publish 69 it was changed significantly (I think pre-AoS it worked similar).
Slightly better explanation can be found on UOGuide: https://www.uoguide.com/Magic_Reflection
In short on OSI Psych Resist penalty is much smaller, but it has penalty to max psych resist, and additionally it has reflect pool that can reflect some spells until its broken.
I went ahead and checked how it is on TC right now, here is a screenshot taken on heritage with Human character (JoaT affects it):

Here is with Inscription:

On the other hand on OSI the buff like this Human character:

Human with Inscription:

And Magic Resist affects reflection pool, here is character with 120 Resist and Inscription:

Slightly better explanation can be found on UOGuide: https://www.uoguide.com/Magic_Reflection
In short on OSI Psych Resist penalty is much smaller, but it has penalty to max psych resist, and additionally it has reflect pool that can reflect some spells until its broken.
I went ahead and checked how it is on TC right now, here is a screenshot taken on heritage with Human character (JoaT affects it):

Here is with Inscription:

On the other hand on OSI the buff like this Human character:

Human with Inscription:

And Magic Resist affects reflection pool, here is character with 120 Resist and Inscription:
