When a Power (say, Blazing Renewal) does damage to each Invader, then its threshold effect says "+4 Damage", is that +4 overall Damage, or +3 Damage to each Invader?
When a Power (say, Blazing Renewal) does damage to each Invader, then its threshold effect says "+4 Damage", is that +4 overall Damage, or +3 Damage to each Invader?
+4 overall Damage, done when the threshold is resolved. If it were a per-Invader improvement, the text would read "+4 Damage to each Invader".
Generally, the "+" in threshold effects is just to remind players that the damage is in addition to the damage up in the normal effects.
(Mists of Oblivion changed between the second and third printings, and the current printings no longer have the "+".)
