Sega Master System / Mark III / Game Gear
Collect all nineteen potions and herbs to become invincible after your energy reaches zero. This will remain in effect until Randar, Enni, or energy pellets are used to refill your life.
Hold ++ while Kelesis is walking towards the cave in the opening sequence. When the old woman gives you the sword, she'll instead be a sound test.
See the main page for Golvellius - Valley of Doom / Maou Golvellius (魔王ゴルベリアス)