A highly specialised form of polymorph, this spell allows you to fuse two creatures together into one unique, amalgamated form, allowing a number of traits from each creature to remain dominant in its new singular form. This spell will not work on any animals that have special magical adaptations such as plane shifting powers or fire breath. If the spell is used on such creatures, both must make a Constitution saving throw against your spell save DC or perish due to the spell conflicting with their innate magics.
The altered creature acquires the following basic traits from one or the other of the animals involved in the merge: Body shape, size, movement types, speed, diet, intelligence, attacks, special attacks, special defences, non-magical adaptations, and Armour Class. You can request which traits are adopted in the new form, but otherwise the creature created is randomly determined by the DM.
When the spell is cast, both animals must be within twenty feet of one another and the final animerged creature will emerge in the former location of the larger animal. Both animals must make a Constitution saving throw of DC 10 to survive the transformation; if one fails, the spell fails and the other must make a Constitution saving throw against your spell save DC. If you attempt to merge opposing-blooded creatures then the DC increases to 16 for the transformation survival saving throw. If either creature has an Intelligence greater than 3, then there is a 75% chance that the creature's mind will shatter, creating an uncontrollable, mad animal. The creature will use every physical ability it has to escape and attack anything that moves, perceiving movement as something causing it pain. The creatures are 99% unlikely to breed true unless the magic has been sealed with a permanency spell.
This spell can also be used to separate a creature which has been affected by a casting of this spell, though it will not function on offspring of a magical merging that has bred true. The component animals must survive the same Constitution saving throws as when originally merged - those that survive are apparently normal in every way (including intelligent creatures regaining their mind, having hazy memories of their time merged).
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