In Sonic Adventure 2, during the final battle between Sonic and Shadow, if the opponent is Shadow, then he will launch the Chaos Spear at Sonic if Sonic is too far behind on the runway. In the multiplayer "Race Mode", after Shadow gets 40 rings, he can use the Chaos Spear to impede his opponent. Also, in the Dreamcast version, Metal Sonic can also use Chaos Spear in the multiplayer mode.
Shadow the Hedgehog
In Shadow the Hedgehog, the Chaos Spear can only be used in the final boss battle against Devil Doom. In this iteration, Super Shadow can charge up Chaos Energy into a large Chaos Spear that is shaped like a lightning bolt in order to wound Devil Doom. If it is released before being charged to its peak, Shadow unleashes a smaller blue lightning bolt called the Chaos Arrow. Despite being somewhat weaker and can only cause minor injuries on Devil Doom, they have the advantage of a faster rate of fire and are good to destroy debris and pop balloons containing Ballon Rings.
Sonic the Hedgehog (2006)
In Sonic the Hedgehog (2006), Chaos Spear is performed by the player pressing / in mid-air while jumping. Shadow can shoot a Chaos Spear which is capable of paralyzing opponents, and can be charged by holding the buttons down. The technique can be upgraded when Shadow activates the Chaos Boost Level 2 and above, which upgrades the Chaos Spear into the Chaos Lance which can cause explosive damage. Another version of the Chaos Spear also appears during the battle with Solaris called the Spear of Light.
Sonic Chronicles: The Dark Brotherhood
Shadow hurls spears of raw Chaos energy that ignore armor.
In Sonic Chronicles: The Dark Brotherhood, Chaos Spear is one of Shadow's POW moves. When performing Chaos Spear in this game, Shadow walks up in front of the opposing enemies and forms a purple Chaos Spear in each of his hands. He then grabs the Chaos Spears as if they were real spears and throws both of them at the opponents.
In gameplay, the Chaos Spear deals attack damage to a chosen target with two strikes. When it deals damage, Chaos Spear pierces armor. However, if there are more enemies present on the opposing side of the battlefield besides the chosen target, the is a chance that one of the Chaos Spears will hit one of them instead of the chosen target, resulting the chosen only receiving one strike. The higher the level of Chaos Spear is, the more attack damage it will deal.
When performing Chaos Spear in gameplay, the player has to complete a series of quick-time events by performing certain actions on the Touch Screen, in order to execute Chaos Spear optimally:
The player has to touch the inside of three circles in succession when the outer circles overlap the inner circles.
The player has to touch and stay inside the outer circle that appears when it overlaps the inner circle and follow it in a straight line from the upper left corner of the screen to the lower right corner.
Missing or not touching these circles correctly will either result in Shadow missing a strike or the damage from the attack being reduced.
During the mission "Lancelot Returns" in Deep Woods, Lancelot will use Chaos Spears in the fight against Sonic. When he get too far away from the player, he will fire Chaos Spears either from the palm of his hands or in clusters above him.
Sonic & SEGA All-Stars Racing
In Sonic & SEGA All-Stars Racing, Shadow will use Chaos Spear during his All-Star move. Shadow will transform into Super Shadow and fly along the track, if you press the ITEM button Super Shadow will launch Chaos Spears on the track that will explode once it hits the ground. The explosion has a blast radius that will take out other racers as long as they're in range.
In Sonic Generations, Shadow uses Chaos Spear several times in the battle against Sonic. Shadow performs Chaos Spear when Sonic falls too far behind, Shadow also performs Chaos Spear during his special attack after gaining two/three Power Cores, Shadow launches several Chaos Spears onto the ground that Sonic must avoid by using Quick Step. Afterwards, Shadow performs a larger Chaos Spear, launching it directly at Sonic, one that also can be avoided using Quick Step.
Appearances in Other Media
The Chaos Spear has been used repeatedly in Sonic X to a great effect, often allowing Shadow to brush aside powerful, and occasionally physically stronger, opponents with ease. Using it, he fought off numerous ships, punched holes in the Blue Typhoon and been able to tear the leg off of the X-Tornado, all with minimal effort. In another episode of the series, Super Sonic uses what appeared to be yellow energy bolts, an ability which could possibly be a derivative of Chaos Spear, to strike down a group of Metarex soldiers before engaging in combat with Super Shadow; though it's not confirmed if this truly was Chaos Spear or not, as Sonic never said a word while doing this attack; however, later in the series, Shadow doesn't say a word when performing the move.