Well since u don’t know that this is not a terror essence, seems that there’s a lot of ‘‘lack of understanding’’ on your part too.
Is an abissal essence.
From blizzard patch note:
‘‘The new Affixes can boost your skill range, increase your movement speed, maximize your dash skills, reduce incoming damage and more. They also can stack up to 3 times to increase their potency. Additionally, there are rare Affixes that take the base Affix potential to the max. Players can find these Affixes on items dropped in Erebban and the Abyssal Verge.’’
And with that post i’ve answered your question from march. the number 2 and 50% are both green, and there’s no text about cooldown or duration if the affix.
so, what 2/4,3/4,4/4 should increase?