SoS lvl 1 provides similar plunder to a guild now, but I believe has a larger hit range, hence when "shadow hansels" are now very popular.
i converted 49 guild lv4 to sos lv1 n i got 1,519,519 extra ally plunder bonus per hit in regular haunt. but thats with a rime elf lv1 as my balanced atk build, not a coe. each guild that u convert to sos lv1 increases the plunder exponentially and also the plunder reward after eb ends. this is not true for sos lv2 tho. i tried converting 4 sos lv1 to sos lv2 and the plunder keeps dropping. n drops further when i converted 2 of the sos lv2 to sos lv3. although im not sure whether changing to sos lv2 can increase the reward plunder significantly since i changed back to sos lv1 straight away.
Kaiethis, u have to go to lv3, and u have to fill just it all, my plunder went up I think it was 8m a hit or something, been awhile. Let's just say a lot.
I wanna be a T6 hansel when I grow up.. I'm tired of staying small and being afraid to get hit by big players