On Your Mark is barely a solar aspect. It does what general armor mods can do and has no connection to the solar keywords. I appreciate that it gives 3 fragment slots, but it definitely needs something more to make it worthy of being an entire aspect. I propose scorching rounds, because i think it'd be pretty cool. I don't really care what this would do to the PvP meta, I just think it needs something more to make it worth using in PvE aside from having 3 fragment slots.