Parus element

[The Legendary Joe]

I only have claytos armor, 2 safety ring, geffen helm, and is horn shield reduce magic damage ?

Yes the horn shield will reduce the magic damage.
The safety rings will help as well since they give some mdef along with that Geffen Helm (higher the refine the better).

Technically, Doesn't ranged resists only reduce magic damage if they're further than 4 cells away from you? Thought there was something like that involved in Range resists.