Your home town was attacked by little green creatures with strange machines. The Duke and many of the townsfolk became suspicious of the tower. The Squire and several of his men entered the tower and haven't come out.
The Duke has sent you to notify the neighbouring towns to beware the towers. Upon arrival at Lastwater you found the town slaughtered and the tower infested. You drove the creatures to beat a hasty retreat through a portal at the top of the tower.
While piecing together the scene you can see the whole landscape. If you would like to adjust your number crunches to accommodate new discoveries and level up to 5, go ahead. Please stick with the current class, race, and personality. When you are ready, post stat blocks and make perception checks.