• 1.1. Silver Skeleton Warrior : As the main human shield in the early stage, upgrade it first to protect the base and vulnerable units.
• 1.2. Skeleton Mage upgrade : The Death Bind effect of the Silver Skeleton Mage is extremely effective against cavalry and horse archers, and can also counter rocket launchers.
• 2.1. Scorpion Soldier : Upgraded to Silver level, the Scorpion Soldier not only has strong attack power, but can also restrain the dwarf's mechas, which is the key to balancing the battle situation.
• 3.1. Silver Spider : Improve the spider's combat effectiveness, splash damage and poisoning effects to make it a dominant player on the battlefield.
• 3.2. Golden Spider : Upgrade to the gold level. The spider's slowing down and summoning small spider skills make it impossible for the opponent to hide.
Through this upgrade sequence, the Lich clan's research institute will be gradually strengthened to ensure maximum effectiveness in battle. Remember, a reasonable combination of troops and strategies is the key to victory!