Drain instantly deals damage to the target(s) and restores HP to the Hero equal to half the damage dealt. It's damage is very low; only Hard Ball and formulas that do damage over time (Slow Burn and Corrosion) do less damage than Drain.
Drain's usefulness against Double Drain is a trade-off. Double Drain has much higher power, appropriately doing approximately double the damage on average. In exchange, Double Drain's ingredient needs are steeper than Drain's, needing two Vinegar, an ingredient only a few merchants sell, while Drain's ingredients are more common. Overall as an offensive formula, Drain is severely lacking, and its low power also means it won't heal much HP. Drain is simply too low-powered to be of much use, even at high levels.
|Level||Minimum damage||Maximum damage|
Acid Rain - Atlas - Barrier - Call Up - Corrosion - Crush - Cure - Defend - Double Drain - Drain - Energize - Escape - Explosion - Fireball - Fire Power - Flash - Hard Ball - Heal - Lance - Laser - Levitate - Lightning Storm - Miracle Cure - Nitro - One Up - Reflect - Regrowth - Revealer - Revive - Slow Burn - Speed - Sting - Stop - Super Heal