If you activate a card or effect that costs Bloodbourne and your Warlord cannot take the full required damage to pay for the cost of the Bloodbourne, then your Warlord will die and you will lose the game.

No. Once you have activated or set face down any Unified or Fortified card to your side of the field, the card is considered in play, and therefore part of the battlefield now.

All activated or set Unified and Fortified cards must remain on the battlefield until they are either used and sent to the discard pile, destroyed by or removed from the field by a card effect.

No. Whether your Warrior spaces are full (Max 5) or not, you cannot choose to sacrifice or send any Warrior you control to the discard pile.

A Warrior can only leave the field from being destroyed by, battle or removed in some way by a card effect. (i.e. destroyed, shuffled away, returned to hand, sent to discard pile, or eradicated.)

No. When a Warlord is attacking a Warrior, the Warrior being attacked receives the damage, but your attacking Warlord does not take the damage back from the battle.

Also, if your Warlord is being attacked by a Warrior, your Warlord does not deal damage back to the Warrior from that battle.

In battles involving Warlords, whether it be Warlord against Warrior or even Warlord against Warlord, only the one attacking deals the damage. Their is no damage dealt back to the attacker.

No. Cards can only be discarded from your hand in TWO different instances.

One, only if a card effect says you must discard a card or card(s).

Two, is if you have more than 8 cards in your hand at the end of your turn. Then you must discard down to 8 cards (Maximum Hand Size) due to game mechanics.

*If you have to discard cards down to 8 at the end of your turn, you get to choose which cards are discarded from your hand.

All cards discarded from the hand are discarded to the discard pile unless otherwise stated.

No. If you have a face-up ACT Unified or Fortified card that has a "You can only control 1 face-up" clause in it's card text, you cannot play another one face-up and destroy the original one.

You have to find a way to remove the current face-up ACT Unified or Fortified on your side of the field if you wish to play another one of the same name with the "You can only control 1 face-up" clause in it's card text.

Card effects in the discard pile can activate their respective effects only during the eligible turn that they would be able to activate on the field.

This means if a Unified card was in your discard pile, you can only activate its discard pile effect during your turn.

As with a Fortified card that was in your discard pile, you can only activate its discard pile effect during an opponent's turn.

Yes. If cards are discarded, eradicated, or sent from your deck to the discard pile by card effects, and they have an effect that triggers off of one of those conditions being met, the effect will still trigger regardless of it's card type.

This means if I send a card from the top of my deck to the discard pile during my turn and it was a Fortified card that had an effect that happened when it was sent from the top of the deck to the discard pile, the effect would still trigger.

This goes for the same, if the card had a discard from hand effect or an eradication effect, as long as the conditions to trigger the effect were met, then the effect would trigger.

If you declare an attack with your Warlord or one of your Warriors targeting a specific attack target (i.e another Warrior or a direct attack on a Warlord) and the Battlefield state changes (i.e Warriors leave the field, new Warriors enter the field, or Warriors attack power increases/decreases) you can re-declare your attack target.

However, even if you are re-declaring your attack target and choose to follow through with the attack, you must still attack with the Warlord, or Warrior that you first declared the attack with. You can , however chose to cancel the attack, and that will count as your Warlord or Warrior's attack for the turn. 

Holy Counters are a game mechanic that currently only sees play in the Angel Legion and cards associated with the Angel Legion.

Being unique to Angel cards, Holy Counters are a mechanic designed to prevent destruction of your Angel cards. 

For instance, if you have an Angel card(s) on your side of the field with 1 Holy Counter on each of them, they essentially all have a shield. This means if you, or an opponent were to use a card effect that destroys one (or more) cards on the field, the Holy Counters would prevent the destruction of the Angel cards with Holy Counters on them. The Holy Counters would be destroyed instead of the Angel cards.

(i.e. If there is a destroy all Warriors on the field effect, all Warriors with at least 1 Holy Counter on them would not be destroyed. A single Holy Counter would be destroyed instead.)

1 Holy Counter = Prevention of 1 instance of destruction

*However this equation listed above, only pertains to a card effect that says destroy. This does not account for damage dealt by battle or card effect. Damage dealt to Warriors with Holy Counters deals with the Holy Counter mechanic very differently. 

When dealing damage to Warriors with Holy Counters on them, the Holy Counter mechanic works differently than single instances of destruction.

For example: If you have an Angel Warrior with the (Atk: 1) and 5 Holy Counters on the Warrior and you are battling an opponent's Warrior with the (Atk: 5); normally your (Atk: 1) Angel Warrior would be destroyed in this battle if there was no Holy Counters on your Warrior, after your Angel Warrior dealt 1 damage to the (Atk: 5) Warrior.

However, in this example, your (Atk: 1) Angel Warrior with 5 Holy Counters on it would not be destroyed in this battle. The 5 Holy Counters on your Angel Warrior would take each of the 5 damage being dealt to the Angel Warrior.

Breaking this down further, the Warrior with (Atk: 5) would deal damage through the Holy Counters, meaning that the battle happens, and since the (Atk: 5) Warrior would destroy the (Atk: 1) Angel Warrior; a Holy Counter is broken instead. This means the 5 Holy Counters on your (Atk: 1) Angel Warrior would each take one of the 5 damage being dealt by the (Atk: 5) Warrior attacking you. This results in both Warriors remaining on the field still after the battle resolves, and all 5 Holy Counters on your Angel Warrior would be destroyed instead.