OH YES, THERE'S MORE!!! To the Muadru than meets the eye!
The Fenrings show up at the Arrakeen Residency to pay their respects. (Little Marie is already there for some fool reason or other, and has been befriended by Little Alia.) Paul takes Fenring down into the catacombs beneath the citadel...tunnels and spaces whose walls are covered with...MUADRU SYMBOLISM!!!
Paul sort of expounds his Muadru lore at Fenring, who pretends to have not known about the catacombs.
OH! Apparently the Muadru arrived on Dune before it became a desert!
OH! Some legends (told by whom, based on what?) suggest that it was they who brought the sandworms to Arrakis!
OH! Remember how we have remarked on the similarity between
Muadru and
Muad'Dib? Paul says, "There appears to be a linguistic connection between the Fremen and the Muadru, but the latter race vanished at independent sites all over the galaxy—suggesting a terrible cataclysm that took them all at once."
Yeah, they probably foresaw what Kevin had in mind and tried to destroy themselves. Gah.
The above shit is on p. 486 of the UK ppbk.
I assume this is the last of the Muadru passages in this one. No doubt one of the post-Legends/pre-Houses decalogy will be entitled
The Muadru of Dune.
OK, new topic:
THE ASSASSINATION ATTEMPT!!!
So we've got the three Fenrings visiting in the Residency. They make their move at dinner time. Marie is the first attacker. There are some booby traps that no one has discovered in all these years, some paralytic-gas releasing Tleilaxu necklace beads etc etc. Marie tries to penetrate Paul's shield with some Ixian needle whip thingy, Alia comes to her brother's defense and Marie goes after her. Alia grabs the Shaddam dagger, which Fenring has brought to the dinner table and eventually kills Marie with it. (This, by the way, is the origin of the "St. Alia of the Knife" name?) Fenring collapses over the dead body of the little girl and Paul, his spidey sense tweekin' like crazy but moved nonetheless by his brotherly feelings toward Fenring, come closer and Fenring pulls the dagger from the girl and plunges it into Paul's chest.
He crumples, starts to bleed out. They call the Suks, but they figure they have no chance of saving Paul until Chani has the brilliant idea of moistening his lips with Water of Life to put him into a spice coma. While his heart is stopped the Suks repair the damage and then his heart starts up again. Irulan sees Korba slip the bloody dagger into his sleeve and make off with it.
Ugh...I just vomited a little bit into my mouth.

"Let the dead give water to the dead. As for me, it's NO MORE FUCKING TEARS!"