At first like many of the people of this forum , i also thought it was a rennigan technqiue partly due to the fact that its similar to chibaku tensei a rennigan technique, but also madara activated the rennigan.
But after doing some research and logically thinking about it, it seems like it was really a ems technique and the reason he decided to use the rennigan was to absorb naruto's wind rasengan.
In this link you see him activate the rennigan to absorb narutos tech:
Now later on in this chapter you see him again in susanoo, he makes seals whislt susanoo also weaving seals:
Now you see his meteorite tech:
But after doing some research and logically thinking about it, it seems like it was really a ems technique and the reason he decided to use the rennigan was to absorb naruto's wind rasengan.
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In this link you see him activate the rennigan to absorb narutos tech:
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Now later on in this chapter you see him again in susanoo, he makes seals whislt susanoo also weaving seals:
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Now you see his meteorite tech:
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