You should easily do 15. Once you have your mysteries and sufficient lvl of the town hall development. Remember that spiders will focus ur weakest champion. 

Spider dmg dealers

Coldheart is a must. For spider always use coldheart. If you have two of this champion, use them both. She is insane. 

Juliana is decent. 

You can experiment with royal huntsman to see how he does. 

AOE

Nazana

Another Aoe char with fast cooldowns. 

U also need a healer, ideally with poison debuff.

Get Bellower to 60 with 100% crit and get as much crit damage/attack as possible.If you've geared him right, he'll one shot all the spiderlings with either his A2 or A3 and nearly kill them with his A1. As for the team, I'd use Bellower, Coldheart, Lua, Kael, and Vrask. Vrask will get focused as he is the bad affinity on Spider 14. Becasue of the other 4 champs, there should not be many spiderlings up at once so he shouldn't get focused too hard.

Booora check out videos of incredible john on YouTube. He will walk you through your mysteries and coldheart build. Youll see there why she is so special. 

Booora check out videos of incredible john on YouTube. He will walk you through your mysteries and coldheart build. Youll see there why she is so special. 

One note though if it takes you 19 min. to do a run this means ur artifacts, skills and tawn hall development are still not there. People usaually do 15 lvl between 30s to 4min.