1 - When you first arrive in this tunnel from Sendai's Enclave 2, I highly recommend memorizing a few Neutralize Poison and Slow Poison spells, as you will be attacked by a massive number of spiders. If you're not prepared, you will most likely lose a couple of party members to poison. Move slowly through the tunnel, killing the spiders in small groups to avoid too much damage. 2 - Towards the middle of the tunnel, you will encounter a powerful spider called Lashar'ra. The spider is capable of summoning several more, so focus on destroying it as soon as you can. Luckily, it's worth a hefty 18,700 experience (quite a bit for a spider), so it's worth your efforts. Once it's dead, continue killing spiders towards the exit at area #3. 3 - This exit leads to Sendai's Enclave 5.