The Firesword is a variant of the Baneblade which is armed with an oversized heavy flamer, and devastates infantry and unarmored vehicles as well as morale alike. It can be used to some extent as a dedicated anti-daemon weapon. It's heavy flamers project a sizeable killzone, and the morale damage is through the roof.
The Firesword has almost no serious anti-armor capabilties however, and is almost entirely defenseless against aircraft and long range supression fire, and suffers from a very short range and the slow speed and size of all Baneblade variants. Therefore it should alway be backed up by a sizeable force of dedicated long range support tanks or accompanied by at least one other Baneblade variant to make up for the lack in anti-armor capabilities.