An invisible attacker gets no advantages related to hitting you in melee. That is, you don't lose your Dexterity bonus to Armor Class, and the attacker doesn't get the usual +2 bonus for being invisible. The invisible attacker's bonuses do still apply for ranged attacks, however.
You do not need to make Acrobatics skill checks to move at full speed while blinded.
Night Hunter (Su): As a standard action, you can blend into the shadows of the night, becoming nearly invisible. As long as you are in an area of dim light or darkness, you are invisible (as per invisibility) to creatures without darkvision.
This ability lasts for a number of rounds equal to 1/2 your cleric level (minimum 1). You can use this ability for a number of times per day equal to 3 + your Wisdom modifier.
You can use this ability for a number of rounds per day equal to 1/2 your cleric level. These rounds do not need to be consecutive.
*Miasma obtained at level 5, Plaguebringer obtained at level 13, though their DC is calculated the same way.
**DC is based on WIS, which remains static pointwise throughout character’s career. However, a higher WIS is required to continue spell progression at levels 9, 13, and 17, necessitating a stat-boosting item at those levels. Therefore, though I don’t like to factor in items on these charts, it can be assumed that something like a Headband of Inspired Wisdom has been obtained and upgraded at those times.