RNA exonuclease that acts as a negative regulator of RNA interference (RNAi) (PubMed:14961122). Probably acts by degrading the 3'-overhangs of short interfering RNAs (siRNAs) (PubMed:14961122). Component of the ERI/DICER complex which is involved in processing amplified double-stranded RNA (dsRNA) intermediates during small-RNA-mediated gene-silencing or RNA interference (RNAi) (Probable). Component of the ERI/DICER complex at least composed of dcr-1, rrf-3 and eri-1. Interacts with pir-1. Expressed in the somatic developing gonads and in a subset of neurons. In adults, it is specifically expressed in neurons and in spermatheca.