Monolith Soft (株式会社モノリスソフト, Monolith Soft kabushiki gaisha) is a Japanese game developer. They were founded on October 1st, 1999 by a group of former Squaresoft employees. Formerly a subsidiary of Namco Bandai Holdings and a developer of games for multiple systems, the company was acquired by Nintendo in 2007 and since that time has made games exclusively for Nintendo systems. Their debut games under were the Xenosaga series, a spiritual successor to Xenogears, which many staff members worked on while employed at Square. Other games developed while under Namco include Baten Kaitos and Namco x Capcom. While under Nintendo, Monolith Soft has created the Xenoblade Chronicles series, itself a spiritual successor to Xenosaga. Other games include Soma Bringer, Disaster: Day of Crisis and Project X Zone, which is a spiritual sequel to Namco x Capcom. Monolith Soft also has a division dedicated to assisting other studios with game development. This division was involved in the development of Super Smash Bros. Brawl. The company's main representation in Smash is through the Xenoblade Chronicles franchise, which is represented in Super Smash Bros. 4 and Super Smash Bros. Ultimate as a major series through the inclusion of Shulk, the main protagonist of Xenoblade Chronicles, and Pyra and Mythra, two forms of the deuteragonist in Xenoblade Chronicles 2. Other Monolith Soft-developed series with lesser representation in Smash include Baten Kaitos, Soma Bringer and Disaster: Day of Crisis.
After being leaked on August 19th, 2014 as part of the ESRB leak, Shulk was officially revealed on August 29th, 2014 as a member of the base roster. With him came a stage based on Gaur Plain, several trophies and eight music tracks. Riki appears as an assist trophy and Dunban appears as a DLC mii costume.
Shulk returns in the base roster of Ultimate, along with Gaur Plain and all returning music tracks, as well as new track from Xenoblade Chronicles 2. Fiora appears as a cameo in Shulk's updated final Smash. Pyra and Mythra appear as DLC fighters.