Necromancers – “The Bait” [Campaign 3, Mission 1]

Help! I reached the dungeon and came to a crossroads. On one side, there are lizards that keep killing me, and on the other, there are blue assailants, who are also very strong, and I can’t defeat them. Not far from the assailants, there’s a purple player. What should I do????

Added 20 minutes later
Then, the purple player approaches and kills me along with my 118 archers. What should I do? Should I restart the game? And should I gather more soldiers or what?