The other night, I was doing a few jelly runs with a friend and one of his friends tagged along. This friend pointed out that my Silent Nightblade exploded twice often. Quite simply, I thought it was supposed to always explode twice, because that is what mine does. Always. When he used his charge, he literally never got two explosions. We sat in at the end of a level for two or three minutes charge attacking, and he never got 2 explosions, whereas I always did.
The only difference we could actually find between the two swords was the level they were upgraded into Silents. I had leveled my swords to 10-Heat both times before upgrading, whereas he had made it, upgraded it, then only got it to 5-heat before getting it to Silent.
I guess I am trying to find out if previous leveling effects later items. Everything I have read has said no, but this seems to suggest otherwise. I would do the testing myself, but since I am still <2 weeks of playtime, I don't really have the funds available to throw 800 energy just to find out.
You always get two explosions? As far as I knew it was random and you could get 1, 2, or 3.
I'm afraid I'll have to ask you to redo these tests with your friend in training hall, having each do at least 50 charge attacks.
And make sure both you and your friend have the sword at the same level.