The Witch's After Tea Party (魔女のアフターティーパーティー) is a Melonbooks shop exclusive limited edition short story that came with Volume 15. It was later adapted in Shouhenshuu Volume 3.
Summary[]
After Echidna successfully transferred her soul into the body of Omega, she immediately started to get used to things. She carried a glintstone which contained the souls of the other five Witches with her. Because of Roswaal's spell, the weather was cold and the forest was frozen, making Omega almost freeze to death until she activated a simple Fire Magic spell to warm up, only to accidentally burn the forest down.
Sometime later, Omega got found by a group of eighteen raiders looking for people of special tribes or races. She initially mistakes them for scavengers, people in the past who used to pillage the homes of those who were killed by witchbeasts. Omega requests a proposal for them to stand in front of her for thirty seconds, and if they do so she'll go with them. Their superior agrees, only to allow Omega have Echidna's soul appear, making everyone feel incredible fear, foam from their mouths, scream, vomit, and die. With none of them surviving the thirty seconds of exposure to Omega's miasma, none had been qualified to be the Sage that could rein over the six Witches. Omega thinks back to a dark haired teenager and how he had managed to stay calm while surrounding the six Witches' miasma when these men couldn't even handle a few seconds of her own. Omega borrows some clothes from the dead raiders and thanks them, saying that she would always remember them as benefactors. She mentions that she is quite interested in having a cup of tea after hundreds of years and continues to walk away.