Reduced-Threat Monster (5e Template)
From D&D Wiki
A reduced-threat monster is a less powerful version of a normal creature. This template can be applied to any creature of challenge 1/4 or higher, hereafter referred to as the "base creature."
A reduced-threat monster has half the hit points of the base creature, and all of its attack rolls, ability checks, saving throws, and saving throw DCs are reduced by 2. If the base creature is bigger than Large, its size becomes Large, and the damage of its weapons is reduced accordingly, if applicable. Some reduced-threat monsters might change or remove specific abilities it can use, based on the DM's discretion.
A reduced-threat creature awards half the XP of the base creature for defeating it.