Questions on:
- Duration of Wild Shape for Master of Many Forms (base it off the class that first granted the ability).
- Augment Healing + vigor spells (additional healing only in first round).
- Applying Clinging Breath more than once (the dragon decides at the time of breathing, and each clinging round adds +1 to the time before breathing again).
- Duration of invisibility from a Ring of Invisibility (base off the caster level, i.e., 3rd; but you can spend the actions to reactivate the effect more often than that, and get a practically-continuous effect)
- Handling spells attached to a hallow/unhallow effect, like Dispel Magic of Protection from Energy (apply the effect when the creature enters the area).
- Can Unhallow be dispelled/negated? (No, but a DM can opt to allow a hallow spell to cancel an unhallow spell, and vice versa).
- Augment Summoning + familiar? (No relation, move on.)
- What does "once per day" mean? (Choose a time of day, usually daybreak, when all "per day" abilities reset)
- How to handle vulnerability and resistance to the same effect (example is a frost giant wearing a ring of elemental resistance)
- Temporary applications of the same effect stack? (No, you get a fresh ammount. Undead that grant a negative level and gain 5 temp hit points can't get more than that; more energy draining simply resets the extra 5 hp).