Hi, I just thought to add my request on Elemental Dungeon here as a comment in case of further expansion, as it seems to be easier overall?
1. Sound/Sonic
2. Gravity
To make it a set similar to the past perhaps Poison/Toxic and Acid/Corrosion can be a 3rd & 4th element (although not really something I am requesting, just an idea since you have a set of 4 for each elemental dungeon).