Tainted Grail: Conquest

Berserkers are part of the Children of Morrigan faction, so fight in melee combat and rely on raw damage and Armour reduction for offense. Defensively, most cards will grant points of Block, which will completely negate the damage of one hit per Block point, regardless of how large or small it is, though there are some cards that also buff your Armour for the hits that you cannot Block. Berserkers get a bonus Energy to use every turn if they are below 50%HP, which greatly increases your options. The Berserker Ability card is to gain 25 Armour (take 25% less damage) and Retaliate 5 Damage back to the attacker. This does not apply for hits that are Blocked. The Ultimate Ability is charged by the enemy hitting you, one Charge per hit, regardless of damage. Depending on the number of Charges, when activated you will heal for a percentage of the damage you deal this turn. 4-7 charges is 25%, 8-11 is 60% and the maximum of 12 is 100%.

Combat as a Berserker is very straightforward. Look at the enemy attacks and your current HP, if you are going to die, play your Ultimate or use a Healing Mixture. If you aren't going to die, spend every point of Energy but one on attacking. You can use this remaining point to use Fortify or another attack as appropriate. Try and avoid using your Ultimate before 8 Charges, as the jump is signficant. You can wait for 12 Charges if you like, but this is not essential and depends on how urgently you need to heal. Break the enemy Armour as much as you can and pour on damage if you can't. When you can, remove all of your Block and Stun cards, so you have better damage dealing potential. There is a small risk in doing this, being that some enemies might get damage so high they kill you in one shot, but you can mitigate this by killing them, or using Smoke Bombs to reduce their damage.

When choosing new cards bias the deck purely offensively. A Berserker lives through dealing damage, lots of it and fast. Take a mixture of low and high cost attacks, as cards like Fist of Stone and Skullcracker are worth the Energy, especially if you used your Ultimate this turn. Also of great value are cards that hit all enemies. Bloody Frenzy is an amazing choice, as even though it costs 5HP, it can easily generate a full heal with an Ultimate in play.

When it comes to Passive Skills, there are some absolute must haves:
Calm Mind (first 3 hits on you deal 1 damage)
Blood Fuelled Rage (every hit gives you 25% damage boost next turn)
Berserker Rage (next attack after using Ultimate gets 100% damage boost)
Corpse Shield (gain 50 Armour and 1 Energy per kill, for this turn)
Taste of Blood (for every kill, Duplicate the next attack played)

Nice, but not essential skills:
Vitality (+75 max HP)
Plague Wielder (every hit lowers attackers Armour by 10 for 2 turns)
Pendulum (gain 3% extra damage per hit until the end of combat)

Fight every battle you see, you should reach level 20 in the third area, just before you fight the 3rd guardian.