Clearing Chapter 1 of the Campaign on Normal is fairly straightforward once your team is set up properly.

If you’re struggling, first make sure you level up your Invokers – especially the one that keeps dying in battle. Underlevelled Invokers are the most common reason people get stuck here.

Next, equip relics on every Invoker in the Invokers menu. Even basic relics give a significant boost to HP and other stats, which makes a huge difference to your survivability and lets you progress much more comfortably through the chapter.

Chapter 1 - Normal - Example Team

Any balanced team with:

• 1 frontliner (tank),

• 1–2 damage dealers,

• and at least 1 support or healer

will be more than enough to beat Chapter 1 on Normal, as long as they’re properly levelled and geared with relics.

   
Video Guides - All chests locations

Here's a playlist with video guides where to find all chests on all levels to get 2nd star in each level. 

Invokers: Titan Legacy - Campaign - Normal - Chapter 1 - All Chest Locations