Ogres.
And if the species was not enough to be menacing for the defenders of Daimon City, they had chosen the element that resisted explosives the most, Metal Ogres. As the name had specified, Metal Ogres are extremely sturdy monsters that are rather resistant against fire based attacks. Surely, throwing enough explosives on them will work but there was only that much Daimon City Defenders had in stock yet that doesn't mean that they can't be killed.
On the other hand, the Forest Trolls were less resistant to explosives but they require precision to kill them because of their healing factor. That was why Commander Jin had decided to send out the first responders against the Forest Trolls instead. Annihilating them would be an easier task while the group tries to defend against the Metal Ogres.
