The Server caps are miscs but affect LS similar to Zealots. Red Server Cap doubles LS damage, but halves the rate (you can do some crazy damage with this since Arms of Dragongaurd basically guarantees a LS). Blue Server Cap doubles LS rate, but halves damage. Both are perma rare though unfortunately. The Atrea Dream Dagger gives more frequent LS and the Atrea Dream Rod gives more powerful LS. Both of those can be found the UR GGB shop.