The band's name is a combination of the English words illumination and shade and refers to the contrast between light and darkness that emerges in the songs, as well as the contrast between quiet and heavy songs.

[1] Illumishade was created because Erni had to put together a music concept and band to obtain her master's degree in September 2018.

On 15 May 2020, the band self-released their debut album Eclyptic: Wake of Shadows.

[9] In July 2023, the band signed a contract with Napalm Records[10][11] and the second album Another Side of You was announced for February 2024.

[14] From April to May 2024, they went on their first North American tour as a support act for Korpiklaani.