What if i can't roll attack dice anymore (Break) and i don't have Dev ( Tantrum starts with 0) but i have 4 bones in my backup Plan so i could charge my Axe Collector can i use the backup plan
Of course you can use your BP then. Your dice rolling phase contained 0 dice. The point here is you can't BP first and roll your dice after.
Also, do i need to have a Target to roll my Dev dice.
Same for the baddies can / should they roll their dev dice if they don't have a target.
No, you don't need a target to roll Def dice.