The Deep Roads Expedition - Monstrous Spider
If you go up the steps in the pit and approach the door, you’ll find that it’s locked. Turn around and try to leave to trigger a spider ambush. The giant spiders are weak, so have someone tank the spiders while a damage dealer cuts down the poisonous spiders.
Once the last one dies, a “monstrous spider" will drop down and attack. This guy is basically a dragon that can’t breathe fire, so have fun with it. It’s a long fight, but you should be fine if you can manage your ranged fighters well. Varric will probably be able to dodge a fair number of the spiders attacks, but your mages will probably be too squishy to last long.
The biggest danger is to an average fighter though. A real tank can keep them tied up well, but any other fighter will probably get stun locked. The spider is able to do a vicious pounce attack. It can attack again before you can get up, usually, and if it manages to back you up against a wall, then your fighter will die. Hopefully you taught Anders his revive spell, because it will get a little rough without it. The only thing I really had luck with was the cold spells, which had a decent chance of freezing the giant spider. Horror spells might work too.
If you don’t have a tank that can shrug off the attack, you will probably need to just kite the boss around for a bit. Have whoever he targets just run around in circles for a bit while your ranged fighters plink away at it. This should give you enough time for the potion cooldown to run out, or for your mages to get their spells ready again.
At the halfway point, a few more spiders will drop in, but it’s probably not worth worrying about. Even my mages were able to burn them away before they took anyone out.
If you can survive the grind, and you’re able to run in circles well, then you’ll probably be just fine. It’s a long boring fight, but you can grind it out with a little persistence. After the spider dies, you can loot the side room for a great two-handed sword.
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