1. Why a room full of goblins is a problem
The goblins in the original Grimm Fairy Tales are a good example of a threat becoming dangerous through numbers. When Sela and Bolder face the Goblin Queen's forces in issue #55, Sela can destroy individual attackers with magic. That still doesn't make the encounter easy to survive.
The goblins keep coming. Bolder fights beside her, but they are being overwhelmed, and Sela pushes herself until she collapses. Her ability to hurt them is real. So is the limit on how much she can keep doing while more enemies are closing in.
Their appearance varies across the crowd. The figures have green skin, pointed ears, fangs, claws, and other monstrous features. Some designs include horns or wings. There is enough variation that it would be misleading to take one figure and turn everything about its body into a rule for every goblin.
What is much clearer is the way they operate around their queen. They attack on her orders, guard prisoners, and fill the spaces where escape might otherwise be possible. Sela and Bolder are facing a force that can keep applying pressure after either of them begins to tire.
That makes the goblins effective even when the heroes are individually more capable. Being able to beat one enemy doesn't tell you whether you can beat the next twenty, protect the person beside you, and still have enough strength left to get out.
1. Why a room full of goblins is a problem
· Comics / Grimm Universe