I once had a diseased commander gain 5 months of life from an assassination attempt.
EA Marverni Druid, started the fight at 2 HP, cast Blessing first round, which gave him Regeneration. By the time his bodyguards finished off the assassin, he was back up to his full 8 HP.
After the fight, he lost 1 HP to the disease again.
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Cap'n Q
"Good morning, Pooh Bear," said Eeyore gloomily. "If it is a good morning," he said. "Which I doubt," said he.