Say
"Friends are needed in this times. Orcs, kobolds, madmen like Maher and other threats. And you are chaotic enough for my tastes. Creation is so close to the chaos. To create something you need to change something. "
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We have three hours, I propose to try seal the alliance with something made from efforts of all 3 gods combined. Something that will use at least one domain of each...
I propose to create an artifact, a weapon that the winner of the tournament will get ( I needed two winners of the victorious god will fight each other for the artifact, so we'll get 4 fights instead of 3)
I propose a burning(fire), sword (War, creation) that can be changed in any other kind of weapon (chaos, creation, war) that would suit the owner. Furthermore the weapon can be used create a minor earthquake (earth) or wind (Air) or turn sticks into snakes (Chaos, life, snakes). bonus if it will also become deadly for undeads, including incorporeal ones
It doesn't need to be overly expensive, 50 mana from each god should be enough. It's just a prize for the winner of the fight
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And no minor fire boons, we don't even need to win that much. Even with my proposal above... I'd love to give the sword to Narcissia, for exampe