That Time I Got Reincarnated as a Slime 16

A lot happens in this volume.

There's one more round of power-creep. With Raphael's augmented abilities, Rimuru fulfills the first promise he made to his first sworn friend in this world. Tempest just got a massive power-up (not that it was lacking in power in the first place though). Rimuru turns towards analysing his newly-evolved and newly-acquired skills. These moments are usually a bit lacking in the anime, but I guess it'll take too much screen time to go through all of it.

And the “game world” just got expanded too, as we now get a reveal on Clayman's background, how the harlequins are connected, and a surprising mastermind behind the mastermind. Old and new allies show up as Rimuru makes preparations for getting back at Clayman's interference.