Arachne Shiraori VS Rikudo Sennin Madara (Rinne-Sharingan)
Battle Conditions:
¤ Deathmatch (meaning to eradicate oneself's body, soul or existence).
¤ Both in equal speed.
Since it lacks some important details, I would like to add here some extra convenient conditions for both sides. Tell me if you are okay for those below.
Additionnal Battle Conditions:
¤ First encounter. No information about oneself's opponent in advance. No set-up traps.
¤ Earth-element area. No living beings around. Clear weather. Night. Full Moon.
¤ No area change for oneself's benefit. As Deathmatch, no escape allowed (even temporarily) through another dimension world for recovery.
Alright, let's begin the fight!
Shiraori 0 - 0 Madara
¤ The fact I add "Full Moon" in ABC is needed to activate Mugen Tsukuyomi. But this jutsu only affects shinobi, descendants of Kaguya and chakra users. Genjutsu are uneffective against her.
Shiraori 1 - 0 Madara
¤ Madara is not in the system list, so appraisal impossible. Debuffs on HP, MP, SP and stats are uneffective against him (e.g. Evil Eye of Grudge).
Shiraori 1 - 2 Madara
¤ Madara can't absorb chakra from Shiraori who uses magic, so he can be harmed significiantly due to Pride, Magic God Act and other kind of buffs that increase her stats. Since Madara is on his Sage mode, his Taijutsu considerablely decreases and physical attacks can damage him as well. Shiraori excels in close-range and long-distance combat.
Shiraori 3 - 2 Madara
¤ To avoid close-range combat, Madara uses Limbo to create his shadows (only can be seen perfectly by Rinnegan users) to attack and restrain his opponent or defend his original body from harm. Plus, he also uses Gudodama for offensive, defensive and other purposes.
Shiraori 3 - 4 Madara
¤ Not only Shiraori's Regenerationn (HP recovery) is higher than Madara, but her Patience is so ******' OP she is temporarily immortal with 1 HP while her MP remains. Unlike her, Madara's stamina is nigh-infinite and doesn't feel any fatigue physically and mentally (even by fighting both Naruto and Sasuke).
Shiraori 5 - 5 Madara
¤ Human Path (Soul Eater) and Deva Path (Magnetism) are two kind of Rinnegan powers which can actually be used effectively to defeat Shiraori. A very lethal combo if well used.
Shiraori 5 - 7 Madara
¤ With Great Probability Correction (LVL10, Probability Correction evolved ver.), Evasion (LVL10), Super Thought Acceleration (LVL3, Thought Acceleration evolved ver.) & Future Vision (LVL3) in one combo, Shiraori has high evasion skills and can probably see through Madara's moves as much as his Sharingan can do. Plus High-Speed Calculation (LVL10), Concentration (LVL10) and Parallel Will (LVL9), she has nine of 'her' in her mind (specialized in combat, tactics or magic) who think and act as one. Since Shiraori has ten eyes, she can activate one or more Evil Eye skills.
Shiraori 7 - 7 Madara
¤ With Evil Eye of Static (x2), Evil Eye of Magnetism (x4) and Evil Eye of Extinction (x4) with a perfect timing, Shiraori can paralyze him (far stronger than Nara clan's shadow manipulation jutsu) as long as she keeps looking at him and remains energy, repel any attack continously in the field of view (even Shira Tensei or his Gododama) and erase him while being paralyzed. Or else to be more sadistic, with EES (x6) and EEM (x4), it'll cause severe mental damages that Limbo is neutralized and she'll make sure to send Gododama far enough that they don't expand or explode in the process. She uses Universal Thread to grab and tie him, then Deadly Poison Attack + Corrosion Attack combo + Poison Synthesis to make the most deadliest Poison Ball in the world to make him drink that his Regenerationn is messed up (that's so devilish), so he dies in agony.
Shiraori 10 - 7 Madara
Shiraori wins.
Note: Shiraori is not even in her FULL potential. If she has Eye of the Past Sight right now, she paralyzes him with EES + Universal Thread, uses Abyssal Magic: Rebellion Hell and destroys his soul which is devoured by the darkness (because such things as resistance or even immortality). With the System Magic, she has God / Administrator rights (can rewrite the system skills or the laws of the nature as she wishes). She's definitely 5B Tier.