New DM here. I have a player running an Oath of Conquest paladin. He makes a pretty convincing argument that as he increases his armor class, he becomes harder to hit, and Armor of Agathys triggers less often; but increased armor often translates into increased weight.

Wouldn't the increase in weight make him easier to hit (slower movement, less agile), or at least a melee weapon should be able to hit his armor easier (whether or not it's a hit on him is entirely different).

The spell says it triggers on hit; but it also says it encases the character and their gear... does Armor of Agathys triggers when the attack roll that tries to hit the player does not clear the armor class?

New DM here. I have a player running an Oath of Conquest paladin. He makes a pretty convincing argument that as he increases his armor class, he becomes harder to hit, and Armor of Agathys triggers less often; but increased armor often translates into increased weight.

Wouldn't the increase in weight make him easier to hit (slower movement, less agile), or at least a melee weapon should be able to hit his armor easier (whether or not it's a hit on him is entirely different).

The spell says it triggers on a hit; but it also says it encases the character and their gear... does Armor of Agathys trigger when the attack roll that tries to hit the player does not clear the armor class?