u/Comprehensive_Ad276

I've just finished farming all the materials I need for Forging Master before I do endings C/D. The only issue is I'm planning on upgrading Kaine's sword as one of my upgrades. I would really appreciate if anybody could confirm the following before I accidentally mess this up:

1. I need to create two separate saves before ending C to avoid having to do a third playthrough for ending D
2. Upon completing ending D, I will get the opportunity to do ending E content, but lose my current saves
3. Once clearing ending E, I will get my saves from earlier back (WITH MATERIALS/UPGRADED WEAPONS) and will be able to grab Kaine's weapon, upgrade it and finish the achievment

Thank you for any help you can give me!