Unfortunately I don't have my PHB with me, but I don't recall any mention of HOW a creature knows it's marked, just that it knows. It also knows the consequences of said mark and anything that might happen if they ignore the mark (Combat challenge, Divine Challenge, etc). This is a bit ambiguous, though. There are some people that read the text in the PHB that says creatures know of the consequences(or whatever the exact wording is) to mean they know EVERTHING, and some that read it to mean that the creatures know what Marked does, but don't know about Combat/Divine Challenge until they face it a time or two.
I tend to go by the "they know everything" interpretation as it seems to be a little more RAW/RAI to me, and I figure monsters are experienced enough to know that a big guy in a set of heavy armor is a good fighter and will smack me in the face if I don't focus my attention on him entirely. And then again, some monsters know this but ignore it anyway.
Later!
Gruns
PHB p57 said:Whenever you affect a creature with a power, that creature knows exactly what you’ve done to it and what conditions you’ve imposed. For example, when a paladin uses divine challenge against an enemy, the enemy knows that it has been marked and that it will therefore take a penalty to attack rolls and some damage if it attacks anyone aside from the paladin.
Some people will try to read that as only applying to abilities written up as "Power entries" even though it should be fairly evident there are not supposed to be "Gotcha" abilities in 4E.The RAW seems pretty unambiguous to me:
The RAW seems pretty unambiguous to me:
Quote:
Originally Posted by PHB p57
Whenever you affect a creature with a power, that creature knows exactly what you’ve done to it and what conditions you’ve imposed. For example, when a paladin uses divine challenge against an enemy, the enemy knows that it has been marked and that it will therefore take a penalty to attack rolls and some damage if it attacks anyone aside from the paladin.