Is it worthwhile to start with the tower defense elf evil gun?

Worth it. The only card of the evil energy cannon does not occupy the position of the chariot, and some cooperative cards play a role in the regiment, which mainly plays a icing on the cake in the battle and is worth starting with. Occupy evil cannon: engineering (installed on the vehicle body as a chariot component, without occupying the chariot position), damage type: true (not affected by armor, magic resistance and pure reduction), skill: 100% damage to range targets, initial passive: increase your own attack by 2% after each attack, full star passive: increase your own attack by 8% after each attack, tower defense elf.