The concept of haveing energy phis free drone, like in the old version, is of a higher weight one, that doesnt do anything to the stats(maybe a simbolic -1,2 res drain).
Atm there are 2 phis drones that have absolutly no real use in their drain stats, hurlbat lover max heat and energy, it ia basicly of now use these drains. Duskmaker lowers cooling and regen, really? Like what is he gonna do? The other 2 drain resisr, -5 on void, and -9 on the other one(forgot the name), but they become useless against energy.
Social you lost to Rico because you made 2 mistakes,and because you are dmg oriented energy, Rico against high drain energy, loses, because it is simple math, ash generators hit higher and at range 1-2 then anything else, you would lose to high heaters also(2 heat flames with 360-400 energy) would heat-lockdown you.
IMHO there need to be 1 phis drone to work without energy, like flushy said, has more weight 30-38kg, and lower dmg 90-140, so that there can be some other range at where they can take the fight, this would make also the purifier a viable wepon.