SERIOUSLY : I find some MAJOR problems with these Fortress Upgrade requirements

1. Lvl 8 - ok got there - moving to Lvl 12 - next safe lvl 

    Lets keep the Fortress in their own lane . Lvl 9 and Lvl 13 should have NO downgrades required because Lvl  8 and now Lvl 12 are SAFE - 

2. See how between the Safe zones they are overlapping each other - 

EX: Lvl 9 needs NO downgrade ( because again Lvl 8 is Safe ) Then SEE

Actually lvl 10 downgrade requirement should be a Lvl 9 Fortress

3. Beacon requirements - should NOT START till Lvl 14 

Beacause Lvl 9 and Lvl 13 have NO requirements