Opened (hnoixen). First aorist active indicative of anoignumi. With the "key" (klei). As the smoke of a great furnace (w kapno kaminou megalh). The plague of demonic locusts is here turned loose. Kamino is old word for a smelting-furnace, already in Revelation 1:15 . Were darkened (eskotwqh). First aorist passive indicative of skotow, old causative verb from skoto, in N.T. only here, Revelation 16:10 ; Ephesians 4:18 . By reason of (ek). "Out of," as a result of ( Revelation 8:13 ).