* Vulkan's pledge to help Ga’ri regain the use of her gifts.
* The reason why Fala became so devoted to Vulkan? For her whole life, she was seen as a spare to the family trade, a mere ''girl'' who could only dream to achieve quality. To the Primarch, she was a smith first and foremost, and even when she spells it out for him, he's baffled over the fact that some people discriminate on gender.
* Thalia. [[spoiler:Vulkan's daughter by Fara, the one for whom he would declare war to the Emperor Himself.]]