Immortal call question

In the guide that I'm following It says That I can use more than one immortal call cluster to further increase survivability.

The cluster I'm speaking of is CWDT>Enduring cry>Immortal call>Increased duration. How does having this twice help exactly?

Wouldn't both of the immortal cries go off at the same time and have the same duration? The guide suggests specific levels for these gems. Thanks for any info

It is probably talking about different CWDT gem levels, that means each one needs a different amount of damage to activate and so they activate at different times.

Remember that in the next expansion Enduring Cry no longer works with CWDT, so you should start thinking about other ways of reducing damage.

Makes sense. Thanks for your reply