Just a short question: As a Fighter, can you mark your secondary Target from Cleave?
Attacking in D&D4 has a very specific destination. It means to make a roll to hit them.
Cleave's method of attack is given in the Attack: line.
Attack: Strength vs AC
The target for the attack is given in the Target: line.
Target: One Creature
If the power had secondary targets and secondary attacks, it would use a line like this:
Secondary Target:
Secondary Attack:
Usually these are indented to be part of either the Hit: or Miss: text. Cleave does not have a Secondary Target, nor a Secondary Attack, so while an additional monster is damaged by it, the power never -attacks- that monster.
Combat Superiority's ability is triggered by any and every attack against an enemy, and nothing more. It does not care about hits, misses, damage, effects. It only cares if you've attacked them, and marks them if you choose so.
Seeing as you don't actually attack the monster hit by Cleave's splash damage, you don't actually mark that monster either.
Another way of looking at it:
Let's say you pick up Cloud of Daggers from the wizard's list. (Half Elf, let's say.)
You creatures in the square you place it in -are- marked, because they -are- attacked by it.
However, creatures that enter it later, or start their turn in it are not attacked, they are simply damaged. This means they are not marked.
Another example:
Let's say you pick up Flaming Sphere.
The sphere attacks a creature adjacent every turn. The creature the sphere attacks is a creature attacked by -your- power, and therefore, by you. Those creatures are marked.
However, the creatures who just started their turn beside it, and just took residual damage are not marked.
No d20 roll to hit, no mark.