Lol yeah, even the first Sephiroth's HP bar won't go down until you perform 4-5 successful combos.
Sephiroth in KH 1.5 is stronger than KH 2.5 Sephiroth :D But weaker than Lingering Will and Unknown.
It took me a lot of time to beat Sephiroth and even longer than that to beat Unknown, never...
Completed Kingdom Hearts 3D Dream Drop Distance.
70+ hours of intense gameplay on Proud mode and I barely made it. Can't even imagine how hard Critical mode is gonna be. Young Xehanort is the hardest boss I've ever encountered. Any kind of his attack leaves you with 1% HP, his combos are...
Improvements and fixes
KB4074588 CU for Windows 10 1709 (OS Build 16299.248)
Download x64 (686 MB)
MS released individual patches for all older W10s as well:
Improvements and fixes for Windows 10 Version 1703, Windows 10 Version 1607, Windows 10 Version 1511