No. Players can't do it to survive, so I don't do it to improve monster survivability. I usually know average DPR prior to a fight and give a monster appropriate hit points to endure as long as I want it to endure.
I feel that changing hit points or any monster stats during a fight damages verisimilitude and trust between DM and player.
I feel that changing hit points or any monster stats during a fight damages verisimilitude and trust between DM and player.
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