Companions in "Dragon Age: Shadowkeep" can be enchanted after reaching level 5, and different companions have different useful enchantments. The first is Belala. The enchantment is weapon +40 electric shock damage and protection. Armor +20% healing effect.
What enchantments are useful for level 5 companions in Dragon Age 4
For enchantments, you want to play to each character's strengths. There's not much point in trying to make a character well-rounded by compensating for their weaknesses - Tash will never be effective against enemies who are resistant to fire, and instead of trying to force them to do that, another companion should be chosen instead.
For 'Tash' and 'Flame', substitute any other companion and their area of expertise. At 5th level, enchantments are primarily about demonstrating this expertise.