Stuck in matras infection

[Kaaghan]

Hello everyone ive tried to look online for a solution to my problem (including the quest wikia) but couldnt find anything. Also english isnt my main language so sorry if i make any big mistakes

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Ive talked to the mayor, the innkeeper and the alchemist and ive find the entrance of the grave with the ladder. When i go down there according to the wiki i have to find some bubbles somewhere in the northern parts of the tunnels. The problem is as soon as i enter the tunnels im stuck because of a huge spiderweb and even if i attack it or whatever i try it wont break.

I really hope im missing something obvious here thanks for any help.

[Schicko]

If I remember correctly, I believe you need the Burning Hands spell, which you can buy from the Magic items vendor in the center of town. [spoiler] After you obtain the spell, cast it on the webs and also on the bubbles. [spoiler] Once you find the hidden room, be prepared to fight a strongish monster. You may well need the Stone Skin spell. Good luck. [/spoiler] [/spoiler]

[KGold]

Just in brackets: you can use your weapon against the bubbles, too.