When I first saw all the arpeggiacs islands I originally thought that the combiner was a monster for some reason but then I realized it was the combiner, not a monster, but I really liked the idea of it being a monster so that's what I did! I made a combiner-based monster that's on every arpeggiacs isle.
Amaltrophoc Bio: When a combiner on any specific Isle is given a huge amount of Rhythmite and Arpeggioins while another monster is being combined, a chemical reaction occurs with the Arpeggioins, egg, and combiner, and the Rhythmite keeps it stable. After a while, that egg turns into that of this monster, Amaltrophoc! Amaltrophoc is a pretty simple monster. Its also very fun to be around! Its silly, and its kind, but it isn't very smart. It has lots of problems and Whenever there's a problem it can't fix, instead of getting mad, it channels its emotions into making its sound which sounds like a bunch of glass cups/bottles.