Bone weapon "evolved"? (Not Anima of Mortaccio)

[MadMadDan]

Was playing a normal run with Mortaccio without having Chaos Malachite, and when I hit minute 30 I noticed that my Bone projectiles had suddenly changed into a weird bone ball projectile that was slower and had less amount.

https://imgur.com/a/5bsNNIb

I've never seen this happen before, although admittedly I don't use Bone that often. Does anyone know what this is and how to trigger it? I got a lot of levels around the time it evolved, so maybe it has something to do with Limit Break? My only thought is that I also had Duplicator in addition to Mortaccio's Amount bonuses, so is it possible I had hit some sort of Amount limit that caused it to change?

[Seth Abercromby]

This is indeed tied to limit break, he's throwing so many bones at once that they're overlapping each other, the 'sphere' is actually just a bunch of bones on top of each other with slightly offset animations. Once the 'ball' connects with an enemy they should scatter somewhat randomly.

[MadMadDan]

And because I'd hit 30 minutes, there were no enemies for them to bounce randomly off of... That makes total sense, thanks~