A Purge is a type of ability that causes a drastic slow in movement and attack speed, and has a gradual movement speed restoration over the duration of the effect.
A purge on a hero will initially dispel most negative buffs from allies and positive buffs from enemies. If cast on an enemy unit, for the duration of the effect, it will slow their movement speed, and can slow their attack speed depending on the specific ability.
Most purges on Heroes will slow a unit down to an initial 100 MS, after which they will gradually regain speed for the duration of the effect. The rate they regain speed is determined by how long the effect lasts and an attribute called the update frequency, which is the number of ticks which movement speed is restored. This value ranges from 1 to 5.
For example, Diffusal Blade's Purge has an update frequency of 5. If the unit had 350 movement speed and was Purged, they would gradually regain speed in the following way.
100/140/210/280/350. The way the speed is calculated is that your speed is reduced to 0%, and you gradually recover a percentage of it every tick. For a update frequency of 5, you recover 20% per tick, for 3, you would recover 33% per tick.
Unstable Current will also reduce attack speed by 100 for the duration. Demonic Purge, and Diffusal Blade Purge cast on a non-hero unit will be paused for the first 3 seconds of the duration.
 List of Purging Abilities
 List of Abilities that cannot be Purged
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*Cannot be purged off of enemies.
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