Rotcaller Staff is the 79th most-used weapon under the current filters (0.4% of 698,800 recorded fights), winning 58.8% overall - 6.1% of its wins come against better-geared opponents.
Best against Redemption Staff (95.1%), Heavy Mace (94.0%), Hallowfall (92.1%). Struggles against Bow (20.0%), Spirithunter (20.8%), Arclight Blasters (25.9%).
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.
