Apparently you can summon elder without doing shaper zones?

I didnt do a single shaper influenced map only spider forest with my mf build nothing else and there wasnt a single saper influenced spider forest map either but for my surprise elder by himself managed spread enough to spawn i didnt even know it was possible?

U dont need to run influenced maps to get elder spawn (only to lead invasion direction), u can just wait for him eating 20 maps into his realm