Amascut

Amascut, "The Devourer", is the goddess of destruction. At one point she was considered the goddess of rebirth. She became somewhat disturbed by witnessing her sibling Icthlarin bringing the Mahjarrat to Gielinor who brought great destruction. She vowed vengeance upon her brother and "she brought obliteration, both physical and spiritual". It was after this warping of her mind when she became known and feared as The Devourer. When Tumeken departed on his journey he marked Ichtlarin to rule in his stead, which further angered Amascut. Her original form is that of a cat, and appears in Icthlarin's Little Helper quest. You can talk to Neite in Sophanem to hear Amascut's story. Note that Amascut somehow ended up being a cat's worst enemy, most likely because nearly all cats are guardians of Icthlarin.

She has the ability to hypnotise people to do her will, as seen in Icthlarin's Little Helper, and can also change her physical appearance to some extent, as she looks different in the guises of the Wanderer and Sumona (although, she tends to keep the appearance of a tan-skinned woman with orange/ginger hair and red eyes, so her shapeshifting powers may be limited, or she prefers that appearance).

If you pray at Amascut's statue in the Pharaoh Queen's tomb in Uzer Mastaba, your prayer will be boosted by one point, but you will lose several life points.

History
In the quest Icthlarin's Little Helper, Amascut wants to capture the soul of Klenter, a dead high-priest, before Icthlarin can. She uses the player by hypnotising them and forcing them into stealing a Canopic jar from the pyramid. However, the player for some reason awakens in the streets of Sophanem with the jar, and after touching the door of the nearby pyramid has a flashback where they see themselves traversing the pyramid's traps. After talking with the Sphinx and the High Priest, they decide to enter the pyramid (with the help of their cat) to return the jar to its place. There, they have another flashback where they defeat the jar's guardian and take the jar away. It is there that they realise that they weren't controlling their actions and return it. The player, however, had unknowingly planted one of Amascut's unholy symbols in one of the sarcophagus while under her control so she could teleport straight inside the temple whenever she wanted. The player remembers this deed in yet another flasback and goes to warn the priests who are currently in the pyramid. As soon as the player arrives to foil her plots, she possesses one of the priests and has them try to kill the player. But this fails (hopefully, anyway) after which she goes back to hiding. It is then revealed (in another flashback) that her spell was seemingly lifted from the player by her brother Icthlarin, before the player awoke in Sophanem.

She is also discussed shortly in the quest Contact! and mentioned in Dealing with Scabaras.

In Smoking Kills, she disguises herself as a citizen of Pollnivneach, Sumona. She requests the player go down the Pollnivneach well into the Desert Slayer Dungeon, to save her non-existent "twin sister", Jesmona, in an attempt on the player's life.

She also manipulated Scabaras' followers into attacking Sophanem, but was thwarted by the player. However, Senliten mentions that in simply convincing the Scabarites to attack, Amascut caused them to go against the principle of isolation, which Scabaras holds above all others.

Likewise, in Do No Evil, it is revealed that she both stole Apmeken's sight, voice, hearing, and killed almost all of Apmeken's followers (the only known survivors are the Three Wise Monkeys of Ape Atoll.)

Quests

 * Icthlarin's Little Helper
 * Contact! - does not make an appearance.
 * Dealing with Scabaras - does not make an appearance.
 * Smoking Kills - as Sumona and Jesmona.
 * Missing My Mummy - as a statue you can pray at and receive a small prayer bonus at the cost of some lifepoints.
 * Do No Evil - only mentioned.

Trivia

 * She is the daughter of Elidnis and Tumeken and sister of Icthlarin.
 * She is possibly based on Sekhmet an Egyptian lion-headed Goddess of Destruction who can become Hathor, a Cow-headed goddess of rebirth or on the Egyptian underworld god Ammut, notoriously a devourer of the hearts of the wicked.
 * Until the release of The Chosen Commander, she was the only deity that players had direct interaction with, apart from Icthlarin. And was the first deity encountered in game.
 * In Latin, Amascut means to accumulate, or to enlarge.
 * It is strange that though The Edicts of Guthix state that the Gods cannot interfere with Gielinor by themselves, Amascut is still able to wander the desert. This is most likely because of the desert's obscurity from the God Wars (which mostly happened in formerly Zaros territory), and the fact that her following is limited.
 * The symbol of Amascut is an upside down Icthlarin symbol, an ankh (☥). This is most likely a reference to the Cross of St. Peter, an inverted cross. It is often used as a satanic symbol, because it is the opposite of a cross (although the story is that St Peter requested to be crucified upside down, as he felt he should not die in the same way as Jesus Christ). Therefore, Amascut's inverted ankh shows she is Icthlarin's opposite and his sister.
 * Another thing to keep in mind is that ankhs, (☥), were held by pre-ancient Egyptian gods, This is also a reference that she despises gods of peace (Such as Apmeken).