User blog comment:AquilaeAltair/OnS Theories (S5). Fourth Theory - The seven deadly sins inside of Rigr's weapon (Incomplete weapon)/@comment-36009152-20190917021646

Saito has his nice share of amazing surprises to show! This weapon... thing being the most extraordinary one yet! Interesting there being a dragon like head, stands out most with the others being real world creatures including tame ones like a goat (the sixth one is a bovine like creature apparently a cross between a cow and sheep with multi colored fur and forward facing horns?) so supernatural in more ways than one.

This was good to suggest a meaning behind this conjuration, and what other parts of it could be. Shinya is spot on, a gun amongst medieval like weapons that other cursed gear are was always significant, and of course a tiger animal. Makes sense Mahiru could siphon this into some nifty cursed gear for Shinya. If she was trying to divide that creature into the individual animal heads, maybe Mahiru herself had designs of turning on Saito.

Tenri is also another excellent guess, here is another one for the potential seventh: Saito himself. A creature of the apocalypse tied to the others and something so twisted in it's makeup, Saito fits the bill XD

In simply marvelling at what Saito brought forth, whether for real a smoke and mirrors imitation of a beast of the apocalypse or the real thing, seems it was overlooked on what it represented and whether there are more parts to it. Shikama Doji recognised it so hopefully will see more of Saito's greatest weapon!