How to Complete Ravager
This is a Speed Battle vs. Tigrina, so the objective is to have one of your units (and not Tigrina) deal the final blow to KO the the Yowie.
The law forbids targeting distant units, so you will need to use melee units in this battle if you want to avoid breaking the law.
Since Tigrina is a Gria, you can't block her movement because she can just fly over you. You can try to surround the Yowie before she gets there, and you can try to inflict Disable, Immobilize, or other status ailments on Tigrina to prevent her from taking action.