After the World of Build was merged with the main Kamen Rider world to create a new world, Killbas arrived in the new world and copies the form of dancer Satoshi Kakizaki. Taking a Build Driver from Sento Kiryu, Killbas obtains the means to transform into his Kamen Rider form, Kamen Rider Killbas, which is even stronger than Kamen Rider Evol. Killbas plans to restore the energy of the Pandora Box and use it to destroy the entire universe.

Following his brother's death, Killbas will stop at nothing until he has his revenge against the Kamen Riders in the New World. Killbas is even more destructive than his younger brother and wants to destroy the entire universe, himself included.

Transformation announcement:

Killbas Spider! Are You Ready ? Spider...Spider...Killbas Spider!

Equipments:
-Build Driver
-Killbaspider
-Killbaspider FullBottle

Weapons:
-Kaizoku Hassyar
-Drill Crusher
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Kamen Rider Killbas henshin sound

https://www.youtube.com/watch?v=uS3J69jP_e8