What strategy should I use to complete The Blood Ritual task in the Bloody Tusks Quest?

Question

When you enter the room, you will see Anaztassja, 3 ominous signs, and 2 boxes:

1. Ominous signs gives players an a spell
   • Circle sign gives a ring shaped spell 
   • Filled circle sign grants a trap spell (activated when creatures walk over it)
   • Dash sign grants a wave spell
2. Boxes 
   • North box gives you an Empowered Stake (used to deal damage to creatures in melee range)
   • South box grants you a Vial of Corrosive Blood (used to deal damage to creatures from long distance)

Walk west along the corridor until you find a mist you can't walk past. The goal is to kill creatures coming out of the mist advancing east to kill Anaztassja. Use all your resources (spells and items) to kill these creatures.

There are 3 different creatures:

1. Norcferatu Minion 

• The most common creature in the task
• Fast creatures but easy to kill
• Can be bodyblocked to delay their progress

2. Norcferatu Abomination 

• Slower creatures but with bigger HP pool than minions
• Deal more damage than minion
• Cause the  Fear effect on players standing too close to it
• Should be prioritized as their corpse grants upgrades to players' spells (make sure to step on their body after they're dead)

3. Norcferatu Monstrosity 

• The final boss and last creature to appear in the task
• Focus all damage on him as he kills Anaztassja with one hit

What strategy should I use to complete The Blood Ritual?

Do I need a full team to complete this mission? 

Should I focus on specific creatures and ignore others?

Which players should use what signs? Does the vocation matter?- for example will a mage wave harder?

Which players should use which tools? Does the vocation matter?- for example will an ek deal more damage with the empowered stake?

Are there any tips & tricks to make the task easier?

How long do I have to complete this task?

If I fail, how soon can my team try again?