O'Neill-class ship

"...it is the most advanced technological Asgard creation yet."

- Thor

The O'Neill-class ship is the most advanced warship in the Asgard fleet, and the first series of Asgard ships designed solely to fight the Replicators.

Overview
Named in honor of Jack O'Neill of the Tau'ri, O'Neill-class ships dwarf the Prometheus and Ha'tak vessels in both size and firepower. These vessels carry the most advanced weapons created by the Asgard (excluding their plasma beam weapons). The O'Neill-class has replaced the Bilskirnir-class as the Asgard vessel of choice when engaging hostile forces. These vessels are power by an unknown number of neutrino-ion generators, and possess fifteen Asgard transporters. The Asgard were constructing an entire fleet of these ships to replace their Bilisknir-class vessels, and already had several O'Neill-class ships constructed by the time of the Ori crusade.

Design
The O'Neill-class shares the same aesthetics as other Asgard starships: smooth, curving lines and parallel sets of projections (unlike the Aurora-class) are all part of the O'Neill-class design. These ships are shaped somewhat like the Bilskirnir-class, only with a curved, bulging "head" design for the bow instead of the hammer design of the Bilskirnir-class. The rear of these ships house two engines with visibly glowing thrusters, also similar to the Bilskirnir-class.

Maneuverability
O'Neill-class ships appear to be very maneuverable, as witnessed during the Battle of P3Y-229, which is in part owed to the sleek design of the vessels. During the battle, the participating O'Neill-class vessel was seen making sharp turns at high speeds and engaging in dog fighting-style tactics, which, in part, allowed it to last far longer than the other vessels of the allied fleet.

Technology
O'Neill-class vessels, incorporating the most advanced technologies the Asgard possess, are among the most powerful ships in the known universe. Only Ori motherships, designed and built with ascended knowledge, have proven to be a match for them. Even then, the only time an Ori mothership has bested an O'Neill-class vessel it had the advantage of numerical superiority (4 to 1), and it is unknown if the O'Neill-class ship was even destroyed.

Hyperdrive
The hyperdrives on the O'Neill-class are superior to those installed on the outdated Bilskirnir-class, and quite possibly the fastest hyperdrives ever constructed. These hyperdrives have proven capable of traveling between the Ida and Milky Way galaxies in mere hours and towing the Prometheus back into Earth's orbit across an unknown number of light-years in only a few minutes. The Prometheus was later towed to the Ida galaxy in less than a day; slower than if the Asgard ship was travelling alone, but far faster than any other known vessel.

Shielding
The shields of the O'Neill-class have proven to be very powerful: they are capable of withstanding multiple hit from both the central beam weapon of an Ori mothership and its secondary pulse weapons, both of which have destroyed Ha'taks in no more than a handful of hits. The shields may also be capable of blocking Replicator missiles, as no O'Neill-class vessel was ever shown or mentioned to be infested by Replicators.

Weapons
The O'Neill-class is armed with 4 powerful energy weapons; two of which are visible on both of the ships "wings", with two more at the bow of the ship capable of retracting into the hull. Designed to penetrate the shielding systems of both Replicator ships and Anubis' upgraded Goa'uld shields, the ion bolts fired by these weapons are capable of refracting to bypass a shield and strike a target multiple times. These cannons are the only known energy weapons capable of destroying Replicator blocks (which have traditionally been impervious to energy weapons) through sheer kinetic force, and were also shown to be powerful enough to counteract the upgraded shields on Anubis' Ha'tak.

Known ships

 * Freyr's O'Neill
 * Kvasir's O'Neill
 * The ''O'Neill
 * The Valhalla
 * Thor's O'Neill