Realmbreaker is the 66th most-used weapon under the current filters (0.5% of 341,455 recorded fights), winning 52.5% overall - 9.1% of its wins come against better-geared opponents.
Best against Hallowfall (96.9%), Holy Staff (74.3%), Mace (72.7%). Struggles against Hellspawn Staff (20.0%), Bear Paws (30.2%), Permafrost Prism (30.4%).
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.