Focus

Focus is a Spell in Hollow Knight. It allows healing using SOUL.

Function
Hold down FOCUS/CAST to drain SOUL and regenerate health at a rate of 1 mask per 33 SOUL. It takes ~1.141 seconds to heal the first mask including the initial startup time of 0.25 seconds.

Continuing to hold FOCUS/CAST will continue to heal 1 mask of health as long as the Knight has 33 or more SOUL. This takes ~0.891 seconds and skips the startup time.

If the Knight does not have enough SOUL, it is not possible to use Focus. However, if Focus is used while at full health, or a full cast of Focus is not performed, stored SOUL is still used up. Getting hit by an enemy interrupts casting (even while protected by Baldur Shell or having the damage negated by Carefree Melody) and wastes any SOUL used during the incomplete cast.

Modifiers
Several charms change the way Focus works:
 * Baldur Shell gives protection while focusing.
 * Deep Focus heals 2 masks of health per focus at a much slower rate.
 * Joni's Blessing turns all masks into lifeblood masks, preventing the player from focusing.
 * Quick Focus allows the player to Focus at twice the speed.
 * Shape of Unn allows the player to move while focusing.
 * Spore Shroom creates a cloud of damaging spores after focusing.

How to Acquire
The Knight starts the game with this ability. A tutorial prompt will appear the first time the Knight is injured, but Focus may still be activated before this.

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