SB 8.10.45
sasarjathasurim mayam
antardhana-gato ’surah
tatah pradurabhuc chailah
suranikopari prabho
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My dear King, Bali Maharaja then disappeared and resorted to demoniac illusions. A giant mountain, generated from illusion, then appeared above the heads of the demigod soldiers.