A small metal plate with a letter carved into it. It was a simple 'Z', with nothing else on there. While sitting on the chest of the dead 'M', who just had his heart practically ripped apart by the Three of Swords' blades, Eiro was looking at the tag that he was given when he joined the organization.
He was glad that he was finally a letter. It would make things a bit easier at some point, probably. It also removed any doubt in Eiro's mind that these rules added by the organization were completely and utterly made up without any proper reason behind them.
Eiro stood up from the dead body and quickly took the item responsible for the creation of the fake Aegis around 'M', a small necklace. These artificial artifacts were really rather useful, to say the least. He couldn't find anything that seemed like it would be able to change the weight and trajectory of the boots, so it was most likely an ability that 'M' himself had.