I am sorry for some problems with the new update. They are all now resolved. For some players, the progress of the treasure quests wasn't counting. This is now fixed.
what is the use of skull? it's stat is so low even for rare one
Every game needs good and bad monsters - and this is definitly a very bad one. I would suggest using it to turn it into energy

(unless it is really rare (maybe ultimate+), then the stats get quite good on high monster levels)