You might as well kill him before.
Why? I get more EXP from the Mobility/Column checks, the guys the columns kill, the Intimidate check, and killing the Templar that spawns. I get to items early anyway without having to blow the 300g, which I what I'm there for.
You could get it at release too, there are 5 essences in C1.
One (two?) of which are in Garrison, which is too late. I tried to get it in Act 1 recently and it wasn't available. Are you sure it only takes one now?
300 gold is nothing. Spending those 2-3k gold makes it much easier to complete most of the content in act 1 before stay of execution. It's free exp that allows you to reach level 5 quite quickly.
The weapon you get for killing him allows you to easily kill shadows in the market.
Finean requires Woljif to be recruited, so I don't do that until fairly late in Act 1.
The Kukri? You still get that if you tip over the columns. If you've got the patience to do most of Kenabres without Wolj on high difficulties you're a better man than I. The EXP difference just isn't worth it.
Blightmaw is tough when you go there with no arcane casters so you can't cheese his low reflex, playing at core difficulty and I had two deaths killing him, didn't have raise dead scrolls either so there goes the two scales of terendelev. In hindsight not having at least displacement was a silly decision, let alone no haste and no web/grease.
Best thing against Blightmaw is unlocking your Mythic Path first. The Banner debuffs him.
I'm not sure if kukri works, marching terror definitely doesn't.
As for clearing most of Act 1 in a 4 man party, it's not a big deal. Last time I was saving up spell slots so much that I ended up most of the market with half my spells.
What is most important is a good tank that can only survive on long buffs like barkskin and mage armor.
The pet is of course the best. Both Lann and Wenduag are ideal for this purpose.
The first few fights in the market are very easy and do not require much tactics. It's just important not to fight more than one group of enemies at a time. In this area, the most difficult is the fight with the group in the middle where there is a gnome fighter.
After clearing the entire area (except ember), you should create a bridge to the other side.
It is important that all athletics checks are successfully completed otherwise it will be much more difficult because of the debuff.
Fighting the bugs is very simple, just send the pet in front, the other group will be killed by the NPC if you get close enough.
Fighting in the center of the market is easy if you have remove fear, otherwise there is a bit of rng.
Just stay away from the clerics until you kill all the melee.
Fighting the swarm is long but easy. The easiest way to do it is with a single character.
Seelah is perfect for this. Take off her armor and give her a glaive.
The fight is trivial, just hit once and then run away until the next turn. Because swarms are slow, you can do it without any threat.
The fight against the bugs is very easy, the second group will be killed by the npcs if you get close enough.
The fight with 3x Abrikandilu can be quite difficult and if you don't feel up to it, you might as well leave it for later.
The next fight is a group of cultists near the temple. The wizard is the most dangerous here, if you manage to kill him within 2 turns you win, otherwise he will kill your pet.
It is best to start the fight with Vermlek from the back. You place a pet next to it so that it can't cast inflict wounds then eliminate the wizards (they are easier than the previous one).
Then you purge ghouls, bugs and a small group of demons.
If you managed to kill 3x Abrikandil you can go down and then clear the first group of enemies. To make the whole fight easier, you can lead them to the npc.
At this point, you have cleared most of the market without rest.
Estrod's tower is also simple as long as you made a good choice in shield maze.
First you use the columns to reduce the number of enemies and then finish off the rest.
With the weapon you can go back and kill the shadows.
Of course, you can also start with Estrod Tower, and that will probably be more optimal.
What can be problematic is the quest with Nienio (you can't skip this shit). This requires some luck because the enemies will start attacking your character right away.
Nienio, of course, I immediately sent to the tavern.
If you made it, congratulations, you can finally rest for the first time.
Then you can go to Daeran's mansion (after the fight he doesn't automatically start a conversation so you can not finish the quest).
On your way back, you can also visit the Silken Thread Atelier.