| Miner Threat|
|Level type||Boss attack|
| …+Tier 3 Reap (Grimm)|
Max 5 units
|Tentacle, tier 1 Fauns, Fairies, tier 1 Wizards, tier 1 Unicorns, Miners, tier 2 Dwarves|
|Tier 2[not sure] Miner (Lemmy)|
You fight a Lemmy, the boss miner. You have a limited amount of gems. So try to summon cheap units.
Just don't wait to attack the army. As soon as you have no gems, attack.