The 2 multiclass Avenger feats, Disciple of Divine Wrath from PHB 2 and Hero of Faith from Divine Power, contain the following text:
Once per encounter, you can use the avenger’s oath of enmity power. The effect lasts until the end of your next turn. (Disciple of Divine Wrath)
Once per encounter, you can use the oath of enmity power. The effect lasts until you hit the target or until the target drops to 0 hit points. You cannot switch the target or extend the duration of the power in any way. (Hero of Faith)
1) If a character takes both of these feats, are they still limited to one OoE per encounter, or can they use it twice?
2) If a character has Divine Mastery (see below), do they regain the above once per encounter use?
When you spend an action point to take an extra action, you also regain the use of a divine encounter power you have used during this encounter. (Divine Mastery- from Divine Power)