Halloween

is a holiday annually celebrated by the staff and Servants of Chaldea Security Organization.
==Characteristics==
===Halloween Servants===
*Elizabeth Báthory (Halloween) (2015)
*Elizabeth Báthory (Brave) (2016)
*Mecha Eli-chan (2017)
*Mecha Eli-chan MkII (2017)
*Shuten-douji (Halloween) (2018)
*Elizabeth Báthory (Cinderella) (2021)
*Nine-Tattoo Dragon Eliza (2022)
===Halloween Events===
* (2015)
* (2016)
* (2017)
* (2018)
* (2021)
* (2021)
* (2022)
==References==
Category:Terminology in Fate/Grand Order
Category:Historical and mythological events