Specific spell location in Root.wad -> Spells/Fight Specific/HousingGauntlet/SIT Gauntlet/Blood Moon - Ubah.xml
The spell description is +#1:$eA$% $Outgoing_image$ #2:$dT_image$#3:$Damage_image$
I think because the m_effectList value at eA is a negative value it renders with the negative symbol but the description defaults to having a + at the start of the description so it renders like +-25% $Outgoing_image$
I also have a picture of what it looks like but not sure how to upload pictures. (You must be Level 5 (Trusted Wizard) to post links.) Can't post link, DMs are open for the link to the spell picture.