Multicast

Multicast is a semi-active skill that gives you X% chance to use a skill twice. The second cast costs no mana and takes effect just after the first. For damage skills, Multicast increases your dps multiplicatively because the extra effect deals just as much damage as the first. For debuffs, Multicast increases your chance of success since you sometimes get an extra attempt. Multicast works with almost any active skill, even those that don’t benefit from Multicast (such as buffs). However, Multicast does not work with skills that aren't spells. Attack skills such as Bash are not spells so they cannot Multicast.