How do I replace a summoned Primarch?

If you have all your primarch slots currently occupied by summoned primarchs you can swap one of them out for a different primarch type by the following steps:

1. Select the primarch you want to replace
2. Move that primarch to your Home
3. Tap the primarchs button and then tap the “Tech Tree” option.
4. Select the primarch you want to summon from the tech tree and click “Summon”
5. This will replace the primarch that you currently have selected at your home with the primarch type that you just selected to summon.

• The troops that were on the primarch you're replacing will be swapped to the primarch that is being summoned once summoning is complete. You cannot Replace a primarch with more troops than the new one you're trying to summon in.
• A primarch that is being summoned in cannot be attacked.