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If a VC player casts Summon Undead horde on a unit that is near a corpse cart that adds 1 to the summoned creatures, assuming infantry and max size.

Does the VC player get 3d6, 3d6+1, or 3d6+3?

The wording in the VC book seems to imply to me that its 3d6+1.
The VC FAQ seems to imply that its 3d6+3.

FAQ (the PDF wont let me copy it)
A:YES as casting Summon Undead Horde to increase the size of units is the same as casting multiple Invocations of Nehek

Or is this how it works.
The VC player rolls 3d6, and gets lets say 10.
He then heals 5 units for 2 wounds each, and if those 5 units are all near the corpse cart he would heal each unit for 3 wounds each.

You add 1 to the number of creatures summoned, not 1 for each dice - while it may work in the same way as casting multiple IoN you arent actually doing so, and therefore your "+1" is only added a single time.

This would be the reason for most VC players spamming single dice IoN