Healing drone heals units in the same hex
While the description says “adjacent”
Forum Discussion
Apparently, adjacent also means directly below it. A drone can heal 7 units simultaneously, I tried this before on a one sided match where my opponent disconnected (I ended it in a tie as there was nothing to destroy but his base). The drone would go back and forth on outside so fast that it would stay on a tile and heal 7 units at once.
