Oaks Minimap for neo-forge 1.21.1 Just Released
Illusioners have had an improvement and are no longer a cut content mob, they have had a texture improvement to match Minecraft Dungeons and now show up during raids.
'assets/textures/entity/illager/illusioner'
Not much has changed with Pillagers besider the fact they now have biome depended textures
'assets/textures/entity/illager/pillager' with the textures called 'pillager.png', 'pillager_desert.png', 'pillager_snow.png', 'pillager_swamp.png'