May I present to you a creature I designed 14 years before the release of Eternal Darkness.
Scuttle is large. The tops of his legs tower 7 feet over his claw feet. Despite this fact it is quick, and capable of rapid lateral movement. Scuttle will circle-strafe the player and despite it's size attempt to hide at a distance behind pillars by stretching its legs and height to nearly 11 feet, or hunkering down low behind low furniture, crossing its legs together to reduce to just over 3 feet in height.
Players unlucky enough not to see this creature conceal itself will be shocked when the single eye upon a muscular stalk suddenly pops around a pillar or over a desk and unleashes a devastating magical attack on a player's sanity, often projecting hallucinations of bugs beneath the character's skin, leading to them to stop attacking enemies and start hacking away at their own flesh with their own blade (and taking damage as a result).
Scuttle will repel all magickal attacks back upon the player and must be killed with melee or ranged weapons. Ranged weapons are most effective, and if a player can hit the eye at a distance it will instantly kill Scuttle. Easier said and done with all the circle-strafing going on. Hitting the legs at a distance works has a better chance and will slow the beast, but not kill it.
If a player must engage in melee with Scuttle the beat will rise up on its back four legs and block all body-based melee attacks with its front two claws, while also attacking the player with them. These legs (serving as arms at the time) must be targeted and destroyed, at which a more-unsteady Scuttle will stand on its back two legs and attack with the middle two. This allows the player to target one of the two remaining legs, knocking Scuttle over and allowing for the finishing move.
Approaching Scuttle from behind is not recommended because it has pinchers back there, and will do this creepy thing where it's head on the thick meaty neck flips totally around to see you perfectly while it savages you with the pinchers, injecting you with a poison that steadily drains health. Sometimes when it's down to four legs Scuttle will flip around and pull this move instead of rearing up. Best to run away and approach again, maybe hit it with a ranged weapon, should this happen.
If you happen to catch Scuttle unawares while it's niding with its legs extended or bunched up, you can sever multiple legs in one hit and possible on-hit kill it as well. I imagine some form of invisibility would be required for this feat.
Inspirations for this design:
Kumonga, arachnid kaiju from to old Tojo movies. Loved 'em as a kid.
Starchild, from the Marvel Shogun Warriors comics I had as a child.
And, since I made the original design in 1988, this inspiration turns out to be nice happenstance: