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Seb-wejem
Normally, when a player isn't at the table we act as if the character isn't either. We might explain it, but don't necessarily feel the need to explain their absence. In the past, I have run a session where I looked after the healing from the paladin, who was our only healer in the game, and just asked the players if they wanted me to burn a healing spell. Normally, we just run with whatever resources we have at the table and leave any absent player characters out of the game with their resources unusable.