PTR Changelog 2016-02-09
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NPC Invaders system has been deployed. Energy countdown timer is reduced to approximately 10,000 ticks for testing purposes.
Walls maximum hits at RCL<2 is reduced to 0 so that they cannot be repaired.
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It seems rangedMassAttack and rangedAttack can be executed simultaniously, the invader creeps are both massing and ranging
According to http://support.screeps.com/hc/en-us/articles/203137792-Simultaneous-execution-of-creep-actions this should not be possible.
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Seems like it's a visual bug, the rangedMassAttack also spawns a rangedAttack visual.