In the Mega Man Zero series, one of the attacks from Copy X's first form is the Nova Strike.Just like how the Ultimate Armor in Mega Man X: Command Mission is given a complete overhaul, its Nova Strike is also different: now X fires a series of explosions. Although the Nova Strike is an invincible attack, it doesn't protect X from spikes but in Mega Man X5, X could use it to travel through the lethal laser beams in Zero Space without damage (or death). He also cannot dash on the ground and activate it. In Mega Man X4-X6, the Nova Strike counts as an air dash and therefore X cannot activate the Nova Strike and air dash (or vice-versa).

To compensate for this added weakness, the Nova Strike's travelling distance is increased, and it can now destroy all bosses in only two hits (the first hit depletes all of the boss's energy but one unit (four units in Hard mode) triggering the boss's overdrive, which is always mandatory). The only downside to this is that it prevents the Nova Strike from being used over and over. It now has Weapon Energy (WE) however, it recharges over a small period of time (a matter of seconds, in fact). In Mega Man X8, the Nova Strike is modified along with the Ultimate Armor. In Mega Man X4- Mega Man X6, X can use this attack infinitely (except in the Fourth Armor's version, where energy needs to be refilled like normal Giga Attacks).

Nova Strike free