Unify damage of arrow-shooting structures
- Arrow shooting structures (towers, CC, fortress, camps...) now deal 10 pierce data per arrow, one arrow every 2 second (i.e. 5 pierce DPS).
- Adjust the count of arrows per building accordingly.
This makes these buildings easier to compare.
Accepted By: Balancing, borg-, wraitii
Differential Revision: https://code.wildfiregames.com/D3668