Rust caste

The title of this article is a combination of two terms which have not been used together canonically, but is based on their use in the comic. "Adventure motivates Rust Signs more than anything else. They crave new experiences, the wilder and farther-from-home, the better. They are confident and energetic, ready to face the unknown. This dynamism makes them great leaders, but it can also make them foolhardy. Often, they don't posses the level of caution they should for someone so willing to jump into new things. Their willingness to trust can get them into trouble, but they are also incredibly resilient. Their ability to bounce back from trauma and injury leaves them as the toughest sign class on the spectrum. Rust Signs make great friends and traveling companions, but they also can be selfish and quick to anger. If what they deem to be an acceptable level of "excitement" isn't happening around them, they have a tendency to try to stir some up. They love the drama. They have incredibly high expectations for themselves and for romantic partners. If someone doesn't live up to these, they may deem them not worth their time. If they aren't careful, Rust Signs can end up in a cycle of excitement, followed by crushed expectations, followed by a quick recovery and new flush of excitement."

- The Extended Zodiac

The rust blood caste is one of the twelve troll blood castes. It is the lowest caste on the hemospectrum, succeeded by bronze.

Names
In Homestuck the term rust is often used to refer to HS 3748 (low blood colors in general) and HS 3605 (Aradia and Tavros' colors in particular), in reference to the red-orange coloration of oxidised iron, with the lowest class specifically referred to mostly in disparaging terms such as HS 4068. The coloUrs and mayhem: Universe A album however used the term to refer to Aradia and her ancestor specifically, with HS 7520 (Vriska later doing the same). The lowest caste is also referred to as rust on the Extended Zodiac.

Kankri Vantas HS 5263 (considers) the term to be a highly problematic slur and instead refers to this caste as.

Physical attributes and abilities
Rust blood is a dark red color similar to the red associated with oxidised iron.

Doc Scratch places the typical lifespan of a troll with rust blood at HS 4068. Aradia, Damara and Xefros all display telekinetic abilities which Vriska describes as HS 7520. Aradia's powers are at least strong enough to HS 2187 (lift the head of a) Frog Temple, while a multitude of Damaras under the control of Aranea were capable of moving planets the size of the players' lands. With Sollux' help Aradia has managed to telekinetically move meteors on HS 2595 (multiple) occasions; the Condesce has achieved similar planet-moving feats by replicating both Aradia and Sollux' powers through through HS 4858 (experimentation). In contrast, Xefros struggles to move many small objects, and often relies on grub juice to keep his energy up.

In addition to telekinesis, Aradia has demonstrated an ability to HS 2135 (communicate with) and HS 2242 (summon) ghosts.