Conflict
Fighting Valentine
External Conflict
Fighting Valentine for the Mortal Cup and keeping it out of his hands is a conflict for all the ShadowHunters.

CONFLICTS

Conflict
Clary trusting the right people
Internal Conflict
Jace tells Clary not to trust anybody but she has a hard time figuring out if she wants to trust the people she has known for years.

Conflict
Being Scared
Internal Conflict
Clary has to learn not to be scared and to over come her fears in order to find her mom and fight Valentine.

Conflict
Opening Up
Internal Conflict
Jace has to learn to open up and trust others be can't always rely on himself.