Draw energy is technique in SLASH'EM. It allows you to draw magical energy from your surroundings, causing your energy to recover at a greater rate. The bonus (or penalty) is in addition to standard energy recovery rates. The technique will last for 15 turns, but will stop if any danger is detected during this time or if you reach maximum power. Even if interrupted the timeout is set to 1000-1500 turns. It is very easy for the technique to be interupted, so engraving Elbereth first, even in the dust, is advisable if it is possible.