Another sunfire idea
Numbers are very rough.
A concept similar to shiv where walking charges the item but it has an active now to trigger the aura.
After "x" steps the cape becomes charged(by walking in the sun or building up heat with friction lol). When the cape is charged it can be activated to cause aoe dmg(either half second or 1 second ticks) for somewhere in the ballpark of 75-85 dmg per second for 3-4 seconds. Could also just be a cooldown somewhere in the 60-90 range instead of walking.
This could make the item feel more dynamic. Allow for more damage when needed and not accidentally aggro when you dont want it to. Maybe have the new active with a slightly larger radius than current sunfire radius.
As always, thoughts and criticism is welcome