If you have just your Dragonform you can explore whole Battle Tower, visit your Necromancer, Alchemist, Trainer, Enchanter ... and find also Sassan and a Waypoint Shrine!
So you can go to the Orobas Fjords and Sentinel Island via waypoint shrine and discover new things in humanform and/or dragonform! Give it a try, save often if you're unsure what can happen next with your hero ...
But one thing: TRY! Go to all places you can, talk with all NPC's you can...
For example: fly to threes on Sentinel Island and land up them to find loot, but attention for the poisonous ground!
