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As stated in the title, one of my players has put their eldritch cannon (Artillerist Artificer) inside the mouth of one of the enemies in their current encounter. I'm struggling to figure out how to handle this situation. They managed to place their weapon inside the mouth of the enemy with a touch attack roll, and succeeded, which makes me angle towards wanting to give them some form of reward for this action. Older editions suggest something akin to a coup-de-grâce strike, instantly killing the creature because of the situation that it's in. I want to be able to reward the player for planning this out, but I also don't want to set an expectation that they should be able to one-hit any enemy simply by placing their weapon in their mouth. I can't find rules for coup-de-grâce strikes in 5e, which makes this a little more problematic, along with whether or not this should be considered a coup-de-grâce to begin with, which makes me think that it should instead simply be an auto-critical, but there is still a part of me that wonders "should it kill the enemy outright instead?"

As stated in the title, one of my players has put their eldritch cannon (Artillerist Artificer) inside the mouth of one of the enemies in their current encounter. I'm struggling to figure out how to handle this situation. 

They managed to place their weapon inside the mouth of the enemy with a touch attack roll, and succeeded, which makes me angle towards wanting to give them some form of reward for this action. 

Older editions suggest something akin to a coup-de-grâce strike, instantly killing the creature because of the situation that it's in. I want to be able to reward the player for planning this out, but I also don't want to set an expectation that they should be able to one-hit any enemy simply by placing their weapon in their mouth. 

I can't find rules for coup-de-grâce strikes in 5e, which makes this a little more problematic, along with whether or not this should be considered a coup-de-grâce to begin with, which makes me think that it should instead simply be an auto-critical, but there is still a part of me that wonders "should it kill the enemy outright instead?"

As stated in the title, one of my players has put their eldritch cannon (Artillerist Artificer) inside the mouth of one of the enemies in their current encounter. I'm struggling to figure out how to handle this situation. I'm thinking it should be a auto-critical hit, but should it kill the enemy instantly instead?

As stated in the title, one of my players has put their eldritch cannon (Artillerist Artificer) inside the mouth of one of the enemies in their current encounter. I'm struggling to figure out how to handle this situation. They managed to place their weapon inside the mouth of the enemy with a touch attack roll, and succeeded, which makes me angle towards wanting to give them some form of reward for this action. Older editions suggest something akin to a coup-de-grâce strike, instantly killing the creature because of the situation that it's in. I want to be able to reward the player for planning this out, but I also don't want to set an expectation that they should be able to one-hit any enemy simply by placing their weapon in their mouth. I can't find rules for coup-de-grâce strikes in 5e, which makes this a little more problematic, along with whether or not this should be considered a coup-de-grâce to begin with, which makes me think that it should instead simply be an auto-critical, but there is still a part of me that wonders "should it kill the enemy outright instead?"