Should I socket an um rune, mal rune or something else? I don’t need another lightning socket

are you playing low player count or something? If you don’t want to use the best option which is facet then use ist i guess

you do need another rbf socket. another -5 elr is a massive boost to your damage

um, mal, sol, ist, ber, jah, 90k fg rare jewel won't even come close in terms of impact

but if you're allergic to rbfs then I suggest cham for smooth micro-movement

Sol

If you dont need another lightning socket
Then i guess mal rune

7fhr 30pr what I use

if no rbf, leave the socket empty