Damn, how many years exactly... - https://mangadex.org/data-saver/8660724c19cdb592fbe1270234826135/6-610943149d49f3943ca22609843a4492159b4f7fa5f08d813c758e2f234afbfa.png
They said that it took like 10+ years until the 40th Floor got cleared so some dude finished up the 20+ remaining floors within a 1 year timeframe... - https://mangadex.org/data-saver/095c19ec034bf07bbf30214b8e0fe96d/4-fab0a19ca996424028cebb861bb79abe747543215a79f7de7a84abf7bad3653a.png
They said "since the appearance" yet it's already been a few years since they still couldn't clear the 10th Floor and shit - https://mangadex.org/data-saver/095c19ec034bf07bbf30214b8e0fe96d/2-29b42aa44a7cbcc85aa86e98f217b335affc63ecf88d4b036f668341bbb0cec9.png
He had 4 Skill Slots as an F-Rank; EX/S+/[2 Unknown exact Ranks] so I wonder how much he has as an E-Rank
I was thinking of him farming everyone's Skills but the Skill Slots exists so the language Skills are investments in a way I guess...