Tau is an ex-war droid – a Tactical Assault Unity – Incursion Specialist.
He took part in over 1000 engagements on the ground. He graduated to a Zero-G board and capture unit and stacked up another 240. He has been the sole survivor from his unit 31 times. Somewhere along the way, he was aware his luck was running out.
Then he and his team had a windfall. During an OP they captured several enemy vessels intact – their unit was awarded a bounty for the prize. Tau spent his on an upgrade – one that would eventually take him out of zero-g combat and into the role of a tactical officer.
After his upgrade – he dropped his serial number classification and adopted TAU-IS as his given name. He is still fully operational (and therefore entitled to use the designation) but for TAU it is a reminder of where he came from and how little luck he has left.