Just as he had thought he reincarnated as slime and that there wouldn't be any immediate danger Rimuru was encountered with what would be a scary dragon, the strongest species by birth, if he wasn't so lonely and imprisonned in a magic prison. As Rimuru talked to Veldora he understod his personnality quickly and they became friends and named each-other but before he consumed Veldora with predator Veldora told him to beware of a certain lady that told him that she would come back to see him very soon and he was very strong for a newborn monster but 50 years ago she was already stronger than him and she surrely only got stronger.
Rimuru wasn't too alarmed as he thought that she souldn't be able to know that Veldora was in him so he exited the cave and begun his village without worriyng about it and he soon forgot about it but when he went to Dwargon and went to the bar he heard that there was a rumour about someone called the 'Wandering Disaster' had come back after diseappering for 40 years but most people didn't believe as it was nothing more than a legend for most and only those that met her knew what a problem it would be if she really came back.
But that wasn't the last time Rimuru heard about this intriguing lady as even shizue talked about her and she was one of her regrets. But the most scary was when Milim wasasked if she knew this 'Wandering Disaster' she answered that she was a pretty funny lady to be around and would surrely be a match for her after 40 years. Which is pretty scary knowing the strength of Milim so Rimuru began to worry a little about this 'Wandering Disaster' and thinking that she may be who Veldora was talking about but he didn't have a time to think about it as he was going to the kingdom of Ingrassia to take care of the regrets of Shizue and he was about to enter his classroom.
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As Rimuru entered his classrom he was assaulted by a fire attack that was launched by one of his students and after that the students didn't seem even slightly wanting to cooperate with him so he had to resort t othe good old way of menacing them with a big ass wolf (more effective than you think. So after that he began to go throught the list and calling them.
"Chloe Aubert."
"P-Present."
"Gale Gibson."
"Present."
"Kenya Misaki."
"Present."
"Alice Rondo."
"Present."
"Ryota Sekiguchi."
"Present."
"Hyena ?"
"Present."
"Did your parents seriously name you after a beast ?"
"Yeah, but thats just my second name but my first I keep for myself."
"Playing it misterious aren't you. Well you do whatever you want but for today we are going to do a test."
"A test ! So boring." Said Kenya.
"Well it isn't a indoor test but more of a fight."
"Yeah, that's something I can work with."
And after that they went to an outdoor spot to fight and the fights went just like in the original (go read it if you want to know) except for the fight of the new character Hyena. ✩ ꒳ ✩
As the fight begun Rimuru was a little more concentrated than for the last as she released more energy than the other childrens but as she was still a children he wasn't serious about it. But as the fight begun he instantly realised that she was incomparably stronger than the other children and she knew how to fight. But even like that she couldn't win but Rimuru ahd a gut feeling that she wasn't using her full strength but he let that feeling go as it would be impossible for a children to be as strong as a A+-Rank monster. Finally he realized that even after that fight their surplus energy he was a little sad as he didn't know how to help them but promised himself and to them that he would do everithing in his power to help them. And helping them he would as some day after he had learn how to help them and where to go and like that their journey to the spirit dwelling begun.
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As they entered the spirit dwelling they heard a voice that didn't seem like it would help them in the slightest but Rimuru didn't need any help and he went through the dwelling without getting lost and faced a big golem wich he disposed of quickly and like that he met his 2nd demon lord since the start of his journey in this new world but sadly enough she was really disappointing and neither felt like a demon lord nor a spirit queen to wich she responded.
"Why do you compare me to this brute Milim, even in the demon lord she is a special case."
"But she said that this 'Wandering Disaster' was as strong as her ?"
" Pff, I could beat her with my 45 moves."
She didn't sound convincing in the slightest but at last Rimuru wasn't here to talk about demon lords but to save the childrens and they went to call for the spirits. And all went the same even if strangely enough the 'spirit' came when Chloe prayed looked weirdly at Hyena but it surrely meant nothing.
As it was the turn of Hyena to go ask for the blessing of the spirit she said that she didn't need one as she already had a unique skill but didn't say it as she didn't want to get separated. Just like that their journey ended and they went back home and later Rimuru went back to Tempest where he would finnaly become a demon lord and without him knowing Hyena erased the memories of the childrens about her and went her own way to follow him but got lost.
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Several weeks passed and it was time for Rimuru to enter the Walpurgis he was with Ramiris, Dino and Darguel. He had Veldora take human form as he was way too big in his human form.
The seating order around the round table was based on the time they became Demon lords.There was strangely enough 12 seats and not 11 as you would except but as it was Guy himself who asked to put an extra seat so nobody asked why it was here.
Everyone entered the room and sat at their chair and they waited for the arrival of Clayman the host of this Walpurgis but as he entered everyone saw the shocking scene of Clayman the weakest demon lord punching Milim and Milim not reacting to it. But as they were about to begin the Walpurgis someone kicked open the doors which destroyed them with that kick while saying:
"Sorry I'm late the road to this place really is bad."
Yep, I'll start at the Walpurgis. I have seen many Tensura fanfic that made the start and I wanted to experiment on doing what come after Rimuru became a demon lord . And sorry I'm a little late.