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Items and skills using this effect stacks with a cap about 85%. Notable that Holy Freeze's slow is not a simple cold and cannot be resisted with items with the Cannot Be Frozen modifier and Cold Immune monsters are affected by it as any other monster, only the periodic (and very low) cold damage will be resisted. Some unique and set items have the "Slows Target By X% mod and there are skills with this effect like Decrepify, Holy Freeze and Clay Golem's attack. Slowing has two main types: non-elemental Slow and Chill. Even monsters that are immune to Cold can be slowed. Cast rate is not affected by Slow. In Diablo II, Slow can happen due to Cold attacks, Holy Freeze Aura, Decrepify Curse, Clay Golem's slowing attack, items with "Slows Target By X%" and Cold Skills. Another way to determine it is to look at the color: blue or light blue coverage (like that of Freeze effect) will mean a definite Chill. General rule is that a Slow effect applied by a Cold skill will most likely count as Chill. Unlike Freeze that paralyzes the target completely, Chill only slows the victim down. Chilled targets are blue in color and move (and sometimes attack) much slower. In both games, any Cold damage may trigger Chill. Chill is a special form of Slow, triggered by Cold attacks and Cold-related skills only.
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