Maplestory "High Five" Private Showcase

So does this mean the same for the skill cores? Because if all the other 5th job skills have had their levels decreased and the formula unchanged, wouldn't that be a big nerf?

Yes, most of them didn't have their formulas changed and the very few things were changed were generally negative. Like I said in my last post, none of the skills were changed such that level dependent values would be the same at the new max level as what they would've been at the old max level (by which I mean, new level 20 is not the same as level 50, it's generally just the same as level 20 was before). Marksman had the damage formula for True Sniping changed so their loss from True Sniping maxing at 50 to 20 was only 140% (per line), and then they also gained an extra hit, making it a buff for them overall, which is why previously I said this pretty much sucks for everyone but Marksman.

Also Decent Skills, and some common skills, had their passives nerfed because of this (going from +10 all stats or attack and magic attack to +4).

Oh, also the 2x coupons now give +100% EXP instead of +50% EXP (maybe that was just some Tespia quirk I'm unaware of), but it does still stack additively with HS now.