Realmbreaker is the 39th most-used weapon under the current filters (0.8% of 673,114 recorded fights), winning 55.9% overall - 7.2% of its wins come against better-geared opponents.
Best against Nature Staff (100.0%), Redemption Staff (97.1%), Fallen Staff (96.6%). Struggles against Bloodmoon Staff (20.8%), Siegebow (21.7%), Rift Glaive (22.0%).
Winrate by IP difference (50-IP buckets, dot size = sample size). A flat curve means the weapon carries regardless of gear; a steep one means it only wins when out-gearing.