Wolfspider
Explorer
The lesson to be learned - it was your own dumb fault. Any pure spellcaster who gets into melee range as anything other than a last resort is asking to die. Just as players who are stupid get what they deserve, same goes for the DM.
I agree wholeheartedly. Unless the druid in question has focused her powers on being a melee baddass, the party should have never even seen her, much less had a chance to melee with her. She should have just trampled them with a treant and been done with them.
I don't have my DMG with me, but does this instant kill effect allow a saving throw to avoid? It certainly should if it doesn't. If it does have a saving throw, I as DM would have simply fudged it from behind the screen and smiled wickedly at the party. There's no use spoiling their fun--or mine--with one lucky blow.