REGENERATION
This power allows rapid healing of any damage a critter has taken.
At the end of each Combat Turn, if the critter has any damage on either of its Condition Monitors, it makes a Magic + Body Test, adds its Body to the number of hits scored, and heals that many boxes of damage, first from Physical overflow, then from the Physical damage monitor, and finally from the Stun damage monitor.
If the critter has exceeded its Physical overflow damage, it’s not dead yet. It still gets a Regeneration Test. If, after this test, its Physical overflow still exceeds its Body, then it’s really dead
Having read the minutia for Regeneration in SR5...it is quite bad with damage being as high as it is. In lethal scenarios, Regen might as well not exist UNLESS the Regenerating target also has gobs of tankiness already.
For subduing scenarios however...being able to refill stun boxes that quickly makes specialized precautions necessary (don't just bring the usual handcuffs and duct tape, is what I'm saying).