My semi-idea based on what you said:

Seasonal Arcs, however different from HV's Season Arcs. If per say, we were to have it so that in Summer there is harsh sunrays making your endurance shortened, Winter is when it is cold and freezing out, Spring has constant showers every 2-3 days, and fall is when the leaves are falling and it begins to get colder out. Each season will give a specific boost to how quickly elemental attacks can be completed and their power is boosted by 1.5 of their current rank. So like an S Rank Suiton, would just be a little more powerful, but not SS Ranked. So S 1/2 Ranked... lol.