Shiva-class nuclear missile

The Shiva-class nuclear missile is a UNSC weapon.

Background
It is a ship-mounted thermonuclear missile, outfitted with a varying payload, a missile thermonuclear warhead assumable to be anywhere from a 20 to 80 Megaton yield depending on its type (most of the missiles utilize UNSC standard 30-megaton HAVOK thermonuclear warhead).

Used by UNSC capital ships, it can also be fitted on C709 Longsword interceptors for a low-profile insertion. They can be fitted with guidance computers for increased accuracy. Upon detonation, the Shiva-class Nuclear Warhead releases a massive EMP, effectively disabling electronics aboard nearby ships.

It should be noted that Covenant capital ship shields have enough power to absorb a full thermonuclear blast from far away but not directly. If the warhead detonates inside the shield, the effects of the blast is multiplied tremendously.

Trivia

 * Shiva is the name of the Hindu god of both disaster and peace.