Your place is far from the center of the battle, behind the back of the warrior.
As cleric, you are tasked with casting buffs on your party.
Such buffs might increase the damage dealt by your party and overall defense, making the battle much easier.
Invest mostly in wisdom and constitution when gaining new levels.
Playing as cleric is based on few principles:
Cleric does not fight- Don’t attempt to deal damage.
Frequently, after receiving damage the enemy is targeting the attacker.
You want to avoid that at all cost when playing as cleric.
There is no definitive equipment pop in- you could make the cleric wear whatever you want.
After buying the ability to wear heavy armor, you might make him into a resistant character.
Focus mostly on increasing the wisdom statistics and reducing the reload time of skills.
The latter is most important when selecting equipment.
Very often, the warrior might be put to sleep or stunned.
Your job is to clean him of any negative effects.
Sadly, you will never be as resistant as the warrior and the battle will quickly end in failure.
When advancing to next character level, in first order you should buy skills related to healing.
The higher the level of ability, the more health points you will be able to restore.
This ability is especially useful later in the game.
Level four required for maximum effect.
Light
Cure Wounds
Prayer of Healing
This skill heals all allies on a limited territory.
Level four required for maximum effect.
Level four required for maximum effect.
Life
Bless
A blessing that increases allies' chance for receiving a resistance to spell.
Second level required for maximum effect.
Aid
A blessing that increases the defense of all allies.
The effect also adds small boost to maximum damage.
Third level required for maximum effect.
Beacon of Hope
Marks an ally to become the central point of the effect.
Each ally that is nearby will receive a bonus to the number of restored health points.
Level four required for maximum effect.
Restoration
Removes the negative effects that affect your ally.
Level two required for maximum effect.
Cleric is not participating in direct battle.
His task is to stand behind the back of his allies, cast buffs and heal the wounded heroes.
When the battle starts, cast Bless, Beacon of Hope and Aid buffs.
This will aid your allies during battle, mostly by increasing their defense.
Cast the Beacon of Hope only on your warrior.

Since rogue is trained in quickly eliminating his opponents, you will drop dead before you know it.
you might always invest a point in heavy armor using specialization and wear plate armor.
Cleric doesn’t have a default weapon that he can use as well.
It can be a staff, a bow or a sword.
However, have in mind that it’s not the damage that is important in case of clerics.
The most important attributes are ability reload speed, wisdom and constitution statistics and damage resistance.
Cleric’s jewelry should contain a reduction of skill’s reload time.
Another aspect of the jewelry should be boost to wisdom statistic and to damage resistance.
As for the armor, focus on maximizing the effect of skill reload time reduction.
When exploring the second act, you will find few pieces of Breakneck set which has that bonus.
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