Darwinian Parasites

a loud, fiery bolt of red energy washes over a creature of your choice that you can see within range, immediately infecting it. The caster must make a Constitution saving throw. if the roll is higher than the target's current HP then the target becomes Infected; otherwise, they Resist and become permanently immune as their HP will reset to its maximum. This spell has no effect on undead or constructs.

if they become infected...                                                                                                          ***           if they resist...                          

STAGE 1: Instantly after contracting the parasites, a fever will begin to manifest.         ***         STAGE 1:  they refill to max HP -any necrotic damage they have taken.

STAGE 2: After 6 rounds or 1 minute, the target becomes comatose and                       ***         STAGE 2: they become permanently immune to Darwinian parasites  

          is considered incapacitated.                                                     

STAGE 3: the target's body becomes a hybrid of the caster and the target.

statistically the target gains the better STR of the two, better DEX, etc. 

<<<<<<<<<<  IF INFECTION IS STOPPED AT ANY POINT IN PROCESS  >>>>>>>>>>>>>>>>>>

if the infection is stopped before the shattering of the outer layer the process reverses, stage by stage, until all symptoms have passed. the infection can be cured through divine intervention or the death a resuscitation of the infected person(s).