Weakly inhibits Kv11.1/KCNH2/ERG1, Kv1.2/KCNA2, Kv1.3/KCNA3, and Kv2.1/KCNB1 (PubMed:29483648). Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Belongs to the neurotoxin 10 (Hwtx-1) family. 51 (Hntx-8) subfamily. Hntx-8 sub-subfamily.