Yesteel

Yesteel is one of the Five Scholars on Nalthis, and a master of Lifeless Commands. He is Arsteel's brother. His most well-known achievement is his discovery of ichor-alcohol.
==Attributes and Abilities==
As a Returned, Yesteel can have the Fifth Heightening whenever he desires, and all the effects that implies, such as agelessness. Like Vasher and Denth, Yesteel probably is well aware how to hide his divine Breath and appear as he wishes.
Yesteel is very skilled at sneaking around, a fact which Nightblood knows of and mentions to Vivenna. This could mean that Yesteel is especially good at surpressing his divine Breath and shaping himself to whatever he needs. At the very least, he is much better at stealth than Vasher and Vivenna.
As one of the Five Scholars, Yesteel is extremely knowledgable about Awakening, and he is an expert in Lifeless Commands. Jewels seems to believe that Yesteel could bring back the memories of Arsteel's Lifeless body, which is far beyond Vasher's capabilities of working with Lifeless. He invents ichor-alcohol during the Manywar, and around the time of the Pahn Kahl rebellion, he has devised a stronger form of the substance. Despite Yesteel's knowledge of Lifeless, he didn't create the original Command to make Lifeless with a single Breath--Shashara did.
He knows Shashara's secret on how to make Awakened swords. However, it's unclear if he knows how to make swords on the power level of Nightblood, or more on the level of Vivenna's Blade. 
Yesteel's current Heightening is unclear, but if he discovered advanced Lifeless Commands, he had to have at least attained the Sixth Heightening at some point. 
==History==
===Return and Scholar===
Like all of the Five Scholars, Yesteel was a Returned. It's unclear how both he and his brother, Arsteel, Returned and how they know that they are brothers. Since Returning, they lack memories of their past life.
He joined the Five Scholars, and there was a golden age in discovering Awakening Commands for several years. Among them, Yesteel was considered a master of Lifeless Commands. Unfortunately, these discoveries were part of the reason for the Manywar, such as Shashara's discovery of a Command that could create a Lifeless with a single Breath.
===Involvement in the Manywar===
During the Manywar, The Five Scholars split, joining different sides. Vasher persuaded Denth to join his side of Hanald, and it seems likely that Shashara also joined Vasher. It is likely that Yesteel and Arsteel went to different kingdoms and opposed Hanald, but it's unknown which kingdoms they went to. They could have gone to Kuth and Huth, Hanald's primary enemy in the Manywar, or one of the many nations in the Pahn Unity, who also opposed Hanald.
During the Manywar, Yesteel developed ichor-alcohol for Lifeless, blood for a Lifeless that meant a Lifeless could stay active longer without requiring additional Breath. It also made it so Awakening them was cheaper. The discovery of ichor-alcohol drove Shashara to research a way to make an Awakened sword--a Shardblade--eventually resulting in Nightblood. Somehow, Yesteel learned how Shashara and Vasher created Nightblood, and was "so upset" about it.
Nightblood hastened the end of the Manywar, but Yesteel's involvement in the war's finale is unclear.
===Post-Manywar===
At some point, Yesteel went in hiding, his whereabouts unknown to Vasher. This could be because of Yesteel's skill in stealth.
Three hundred years after the Manywar, an unknown tyrant recruited Yesteel to restore Kuth and Huth, an action which finally revealed Yesteel's whereabouts to Vasher. Yesteel had created a stronger form of ichor-alcohol, and could be helping the tyrant to cause conflict on Nalthis.
If, during the Pahn Kahl rebellion, the Hallandren Lifeless army had not been stopped, Yesteel would have brought Kuth and Huth to Idris's aid, revealing the secret of the Awakened swords to them. He would have pressed towards Hallandren and destroyed T'Telir.
In the aftermath of the Pahn Kahl rebellion, Jewels sought out Yesteel, bringing Arsteel's Lifeless corpse. Jewels hoped that Yesteel, with his mastery of Lifeless, could help bring back some of Arsteel's personality and memories.
==Relationships==
===Arsteel and Vasher===
Little is known about Yesteel and his brother's relationship. It seems likely that he and Arsteel joined each other during the Manywar. It's unknown how Yesteel feels about Vasher killing his brother, but the murder probably doesn't endear Vasher to Yesteel.
===Shashara===
It seems as though Shashara and Yesteel had a competitive relationship when it came to their scholarship. Shashara came up with the first Command for creating Lifeless with a single Breath, but since Yesteel is referred to as a master of Lifeless Commands he was likely spurred forward to do more with Lifeless. He eventually created ichor-alcohol, and the creation of the substance made Shashara want to show up Yesteel. She did this by researching and creating Awakened swords, resulting in Nightblood, which made Yesteel "so upset".
== Notes ==