large Energy EMP based weapon...
Tachyon Lances not good enough for you?
Tachyon Lances are the pinacle of Awesome but Impractical.
More like Crippling overspecilizaton, or a pure support weapon. Low DPS (but low flux), massive range is where most of it's power goes. However, it tears anything without shields apart, which with its range, means that if any enemy ship gets overloaded or loses shields, then a lance should be able to dead hull damage and apply it's payload of Emp, crippling that ship for a while/until it dies.
That said, it is mostly a sniper-support weapon, which focuses on dealing EMP damage. It cannot effectively break shields unless they are frigate tier (and that is iffy without 2 or more) and generally works best hanging back at max range, using that range (and no accuracy loss and PD like long range missiles have to deal with) taking opertunistic shots to oblitherate any enemy ships that lose shields.
Unfortunately, it is obscenely expensive, easily doubling the cost of whatever ship you equip them to, uses up a lot of OP, meaning that if you put them on a ship, it becomes a sniper, and is weaker at short range as a result.