Now, when the weapon T4 is ready, I need to decide on the sets:
I slightly improved the color of the bone weapons by adding a pinch of yellow so that the bones start looking a bit more natural and warmer. For the T4 there I tried a few colors but ended up with ghosty-blue and yellow-lime. Yellow-lime has some associations with the Undead theme (e.g. Skeletal Mage), but also gives a chaotic feel. Ghosty-blue tells me about despair, souless existence, mysery. I'd call such a blade Ghost Blade, Soul Reaper or just Deathly Blade. In my opinion, this color supports the Undead theme better, even though it's not that bright and striking as yellow-lime.
As for the tentacles, I added more contrast, shaded the edges and "protruded" the light parts in the middle, thereby increasing the volume and adding depth, which in turn improved clarity. By definition, the tentacles should be tangled, constantly moving, wriggling, which slightly blurs the overall clarity of their perception, but we cannot let this go too far.
Special thanks to
@Vinz (he pushed on me!

),
@Kyrbi0,
@Deolrin,
@RvzerBro and
@Wargeras for the feedback!
P.S. Maybe I will also prepare a short presentation on the bone weapon upgrades just to get my thoughts down on paper and make a strategic look around.