
Hmmm.. SPOILERS!!
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Hmm (based only in LN—and not that accurate, sorry folks) after Veldora gets released by Rimuru (by taking his clones), Rimuru finds out that he required FOUR Ultimate Skills then he gets to see the abilities of the Department Heads' (Benimaru and co). After that, (I will take a shortcut HAHA) a conference was held (many known people attended that but I will not say it or it will take years HAHA) AND Ellen from the trio that Shizu help is ACTUALLY a daughter of a duke from another soon to be alliance kingdom of Tempest. During that conference, Rimuru presents Veldora as his friend to everyone's shook (some of them fainted). THEN about Karion and Milim's fight, they thought that Karion is dead. THEN a WALPURGIS BANQUET (a banquet that demon lords attends to welcome new demon lords?) this was all planned by CLAYMAN. THEN STRAIGHT TO THE POINT (⌐■-■) Rimuru killed Clayman and Milim was not really controlled by Clayman (and this fu##ing Clayman hit Milim, just to boast that he controls Milim tch), and Frey and Karion became Milim's subordinate. After that Rimuru obtained the name 'Rookie' (as a new awakened demon lord) and he name the 8 remaining demon lords as the 'EIGHT-STAR DEMON LORDS' or also known as 'OCTAGRAM'. AND ALSO! The TRUE ENEMY is just lurking in the corner (pft and Rimuru met him already—haha spoilers again). That's far as I can remember. It's not very accurate but I hope it helps you (◠‿◕)
Waaah!! Rimuru is now finally a Demon Lord!! >///< I'm so excited for the next chapters and btw thank you for uploading this!! We readers are grateful for this! (≧▽≦) I just finished the LN not too long ago ( ꈍᴗꈍ) and I think this part of the manga is in the 4th book of the novel which is the "Birth of the Demon Lord" (pft correct me if I'm wrong fellow readers of LN) and ALSO I can give some spoilers if you want (◡ ω ◡)