Profile view of energy focusing ship
The energy focusing ship was an organic ship utilized by Species 8472. Larger than its bioship counterpart, the vessel was used to focus energy from other bioships to form an extremely powerful direct energy weapon. This is completely with the assistance of eight bioships that would form a ring around the energy-focusing ship and fire on it. The energy-focusing ship amplified and focused the energy bolts of the eight bioships into one huge bolt. This energy beam was capable of destroying whole planets. (VOY: "Scorpion")
An energy focusing ship was used to destroy a Borg planet in 2373, with assistance by eight other bioships. (VOY: "Scorpion") Using this weapon, Species 8472 systematically annihilated planet after planet in Borg space. In a battle that occurred in the region of Borg space which the Borg designated Matrix 010, Grid 19, eight planets fell to it. (VOY: "Scorpion, Part II")
A side-view of the energy focusing ship was visible on Valerie Archer's Species 8472 desktop monitor. (VOY: "In the Flesh")
Apocrypha
The vessel is described as a "frigate" in Star Trek: Armada II, and it can use its energy focusing ability while grouped with anywhere from four to eight other ships.