Serris

Serris (also known as Serris-X) is the third boss Samus faces aboard the Biologic Space Laboratories research station in Metroid Fusion.

Biography
Serris' habitat was Sector 4. Serris is an aquatic, long, serpent-like creature. Adam described it as a "very large creature" and that it is "capable of moving and attacking at ultra-high speed". There was also a large amount of damage done to Sector 4, believed to have been done by Serris. There is a breeding tank in the sector which Serris often returns to, which Samus must reach to terminate it, despite it being a "valuable specimen".

Once Samus reaches the tank, she finds Serris' skeleton. She proceeds to the next room and fights a copy of Serris, made by an X Parasite, who is the true cause of the damage in sector 4.

The Fight
Serris' only attack is ramming Samus. Serris will jump out of the water and move between platforms to jump over all the platforms from one side of the room to the other. It could also undulate between the platforms. There are railings on the ceiling which Samus can hold onto to avoid the serpent. The entire battle, Serris follows an attack pattern. An example is after going over and under the platforms, Serris will jump and try to ram into Samus while she is on the railing. There, she can shoot at Serris' head, the only vulnerable part of its body, with Missiles. Upon impact, Serris glows and rapidly speeds up, temporarily rendering itself invincible. After a few seconds, it returns to its normal form.

After firing five Missiles or three charged shots, Serris will transform into a Core-X. It is important to remember that its movement is not hindered by water, but the basic Fusion Suit is highly sluggish when submerged. Accidentally falling to the bottom of the pool may prove to be fatal. Once it is destroyed, Samus will regain her Speed Booster ability.

Trivia

 * Serris' shape slightly resembles Botwoon from Super Metroid.
 * Serris' brain is visible, underneath a clear plating on its head.

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