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From Liquipedia StarCraft 2 Wiki
NA Release Date:
June 3rd 2010
- Balance Changes
StarCraft II Beta – Patch 15 (version 0.17.0.15623)
- Improved the system that handles initial placement and promotion/relegation between Leagues & Ladders.
- Weapon upgrade bonus decreased from 1 (+1 Light) to 1.
- Nitro Packs research cost decreased from 100/100 to 50/50.
- Siege Tank
- Siege Mode damage decreased from 60 to 50.
- Anti-air weapon upgrade bonus decreased from 1 (+1 Light) to 1.
- Brood Lord
- Weapon upgrade bonus decreased from 3 to 2.