“When I started here, all there was was swamp. Other players said I was daft to fight a dragon in a swamp, but I fought it all the same, just to show 'em. We sank into the swamp. So, we sent a second party. They sank into the swamp. So, we sent a third one. The dragon got a surprise round, burned us, then we sank into the swamp, but the fourth one… killed the dragon!”
“When I started here, all there was was swamp. Other players said I was daft to fight a dragon in a swamp, but I fought it all the same, just to show 'em. We sank into the swamp. So, we sent a second party. They sank into the swamp. So, we sent a third one. The dragon got a surprise round, burned us, then we sank into the swamp, but the fourth one… killed the dragon!”
It sounds like you’re just feeding adventurers to the dragon.