Tyn has found the monster form of the same thing Esme was summoning. This is another part of the cycle; when maginaria manifest, they sometimes get stuck in the physical world where chroma is much more scarce. Taking their shapes from things they find near wherever they are, they attack people because we're the best source of chroma around. When they do, you need someone like Tyn to go slay them. The core a monster leaves behind is then sold to the Guild and refined into usable energy.
The official server of the City of Elseways.