The_oneandonly344
Technically he could have adapted to make himself super effective in cutting the tentacle and making sure it doesn't regenrate. Do remember it's adaptation we are talking about . Maharaga was able to alter the essence of his cursed energy to bypass infinity and then again learned to bypass infinity by expanding the target of the slashes so sukuna can copy it. Ariel could have made himself like a reppelant to monsters if wanted to.