I’m still on my first character from the first event and I go to the battlefield half the time and wear no armour.
The answer in general is, as deadly as you make it.
Anvil the City itself is Safe, many people wander around unarmed even well after dark.It is the capital city of the empireand as such fights, outside of tournies or arranged duels, are rare and murder is illegal. Their are still assassins but its rare and a shocking thing when it happens not a common occurance.
This changes when you go through the Sentinel Gate and take to the battlefield.
Here there is always the risk that you won’t make it back but even then it depends how you fight.
I mentioned above that I go to the battlefield in no armour and have survived two years? this is because I’m support at the back in the main battles and normally on the battlefield as a mission specialist. I try not to engage the enemy unless i have to and while I carry a sword i can count the number of enemies that I’ve hit on the fingers of one hand.
Now if you’re going to the front line as a warrior then the deadliness goes up. Armour becomes vital not only is it more hits but its protection from enemy calls and arrows. The other major thing that kills people is being drawn away from the line or getting their unit overrun, if we can get to you 9/10 we can get you back on your feet. Which leads into the big place we tend to lose people, on retreats.
Hero points, magic items, potions and enchantments can all help keep you alive but the big things tend to be armour and your friends. One of the hardest things is to learn to fight not just as a random collection of larpers but as a unit, keeping your attention on where your guys are as well as the enemy.
All that said even a combat character is unlikely to die more than once an event , Because unless your body is completely lost on the battlefield you enter a state called terminal wherein you are beyond saving but can while still suffering from your wound hang for as long as you want to say good bye. so if you die early you can groan and moan for the rest of the event (or as much as you want) to traumatise and emotionally upset your friends and family,
Now all that said the answer to your question is likely to be simply this: If you go to battle you might die, if you don’t you probably won’t. So make those characters and see how they do.