kreynolds said:
You have to concentrate for three rounds before you can pinpoint their location. It's in the FAQ, page 44 in the latest version.
That's right, Mr. Icon, but to continue to have knowledge of his position, you need to
continue to concentrate
each round as a full-round action. So, any round you decide to stop concentrating, you no longer have knowledge of his position ...
For example:
Round 1: (Wizard) "I cast Detect Magic and scan the area to the north." (DM) "You detect a magic aura."
Round 2: (Wizard) "I concentrate on the Detect Magic." (DM) "There is one magic aura in that area."
Round 3: (Wizard) "I continue to concentrate on the Detect Magic." (DM) "The magic aura is in [points] this square."
(Now, the enemy mage moves.)
Round 4: (Wizard) "I continue to concentrate on the Detect Magic." (DM) "The magic aura is now in [points] this square."
(Now, the enemy mage moves again.)
Round 5: (Wizard) "I cast Fireball, centered on the square the magic aura was in last round." (DM) "OK." (Wizard) "Any screams of pain?" (DM) "Nope." (Wizard) "Blast!" (The enemy mage moved more than the 20' burst radius of the Fireball, so he was out of the area of effect when the spell went off.)
There's no way for the wizard to both confirm the location of the target aura and cast a spell at its location in the same round. Unless he's Hasted, of course ... What's more, when you stop concentrating, you not only lose your 'fix', but the spell entirely drops. The wizard above, if he wants to try this again, has to burn another 0-level spell (if he has another Detect Magic prepared, of course) and start over from round 1.
My group finished its adventure last night. On downtime, my halfling sorcerer managed to purchase a scroll of Detect Invisibility. I am
not going through that hell again.
