Rotcaller Staff is the 71st most-used weapon under the current filters (0.4% of 322,739 recorded fights), winning 60.1% overall - 5.8% of its wins come against better-geared opponents.
Best against Hallowfall (96.0%), Heavy Mace (95.2%), Redemption Staff (95.0%). Struggles against Claymore (30.0%), Hellspawn Staff (37.9%), Energy Shaper (38.1%).
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.