Stenluke

Stenluke is Angelica's sentient manablade, speaking in a voice identical to Ferdinand.

Stenluke outwardly looks like a regular sword with an expansive Feystone embedded into it's pommel. Sheathed it has the size of a dagger. When drawn it's blade grows to it's full size. Prior to Rozemyne pouring mana into it, the blade had a length of 50 cm when drawn. It is likely that the maximum length of the blade has increased since, but no exact mention of it's length has been made since.

Due to Rozemyne thinking of Ferdinand while donating mana to the blade, Stenluke has a personality and voice the same as Rozemyne sees Ferdinand. It is very strict with his master and respectful to the "master of my master" Rozemyne. Generally it seems to avoid talking to anyone other than Angelica or Rozemyne.

Stenluke was initially just a regular manablade. To compensate for the elemental affinities she herself lacked Angelica fed it feystone of feybeasts and feyplants and gave it mana whenever she could to grow it.

As a reward to putting proper effort into successfully finishing her courses at the Royal Academy, Rozemyne promised to donate mana to Angelica's mana blade. This was only supposed to grow the blade and potentially add some of Rozemyne's elemental affinities to it.

While she was pouring mana into the blade Rozemyne thought that what Angelica needed far more was more brainpower or someone to lecture her so she wouldn't slack off, while thinking of how Ferdinand always lectured her whenever she made mistakes. Somehow these thoughts during the mana transfer ended up giving the blade sentience.

Since then Stenluke acts like an overseer and additional memory for Angelica, providing information she forgot or didn't consider and harshly lecturing her if she slacks off or is about to do something stupid.

Stenluke can only listen and talk while he receives mana from Angelica, which makes it impossible for Angelica to give the blade to someone else so they can teach it. Much to her displeasure, she still has to attend her written courses so that the blade can soak up the knowledge together with his master.