• Your Laboratory forts use Elixir/Dark Elixir to permanently upgrade your Troops and Spells. These buildings can be leveled up until they hit level 8. It’s best to place these army buildings around your Spell Factories and make sure they’re well protected. Place them within its own corner if you choose to do so. Your sole laboratory doesn’t have much health so guard it well.
• The troops you should upgrade the most within your Laboratory should be your Barbarians, Wizards, Archers, Giants and Wall Breakers. If you’re more interested in raiding resources, then add Goblins to that list of troops that take upgrading priority in your Laboratory. Focus on Minions and Golems when it comes to upgrading Dark Elixir troops. As for which spells that should get upgraded the most, focus on improving your Healing, Jump and Freeze spells.
• Here are the Town Hall levels and available number of Laboratories that come with each upgrade:
– Town Hall 1: 0
– Town Hall 2: 0
– Town Hall 3: 1
– Town Hall 4: 1
– Town Hall 5: 1
– Town Hall 6: 1
– Town Hall 7: 1
– Town Hall 8: 1
– Town Hall 9: 1
– Town Hall 10: 1