Frost Armor, High Waters, Into Thin Air, Dark Nut, Lightweight, and Last Words. All these catalyst provides a defensive capabilty for fighters within their respective elements. Meanwhile, Fire elements have catalyst that provides Enrage for an additional offensive power which could be good, but in my opinion, most players prioritize defense over offense for their fighters in rift battles which is why we don't see Triple Fire nodes with both Fire Catalyst in rift battles that much. So, why not make a defensive fire catalyst? As of now, we have two Fire catalyst, Fire Starter and Rising Temperature. Out of these two, Rising Temperature seems to be the best candidate to be a defensive fire catalyst since Fire Starter is good as it is. To make Rising Temperatures a defensive fire catalyst, I would suggest that it gives the fighter a timeless Enrage every 15/5 seconds which could be removed by knocking down the fighter and while close to the opponent while benefitting from Enrage, the opponent loses a % of their health. I think with this suggestion, we could see more Triple Fire nodes in Rift Battles and players trying to diversify their bases in Rift.