A Google search (ai response, so take it with a grain of salt) suggested a 5 person party could take a dragon with 136 hp and 18 a at levels 8-9 comfortably. 7-8 would be hard, 5-6 would be very difficult but possible. Depends on the DM too.
Note I don’t play much 5e, and my experience in TTRPGs outside a few single session stuff is mostly one Pathfinder 2e campaign currently at level 6.
A Google search (ai response, so take it with a grain of salt) suggested a 5 person party could take a dragon with 136 hp and 18 a at levels 8-9 comfortably. 7-8 would be hard, 5-6 would be very difficult but possible. Depends on the DM too.
Note I don’t play much 5e, and my experience in TTRPGs outside a few single session stuff is mostly one Pathfinder 2e campaign currently at level 6.