
1 skull (developed or not) + 2 soft metal bars and maybe something else to make it more expensive
It should be the same as a normal skull, but with a higher percentage of the owner's LP.
For example, if the skull gives 500 lp, the skulltrumpet would give 500*avgmetalquality, softcapped by psyche and smithing. Or something similar.
Rightclicking the skulltrumpet would give the option "doot", which would play this sound