http://pts.allodswiki.ru/calc#!9!331...3…xnxvm/MXTKYVKOC here is pretty much all u might need to support in astral. bear in mind that some rubies on last grid look different on calculator, so just copy the position of the taken rubies. Pretty simple build, dissonance to gain tempo, dancing blade to refresh the offensive buff, resonance barrier, solo and requiem to refresh the defensive one. If you happen to unlock another ruby soon-ish, it's worth to invest it on scary tales ruby.
http://pts.allodswiki.ru/calc#!9!331...3…ijxvm/MXTKYVKOC this is another option, probably easier to play and might have a little better dmg, altho that's not your goal as support (overall dmg would still be very low, hardly getting to a tank level dps). with one extra ruby get the last ruby for requiem.
http://pts.allodswiki.ru/calc#!9!311..33…ijxvm/GQAHCTKOC this one then, lower damage but better mobility, probably the most user friendly support build you can get, thanks to the use of flying blade, which would give you no movement penalty.