The Abomination is notorious for instantly devouring one of your troops. To combat this, kick off your mission by deploying a cheap Miniature or Squad as cannon fodder. Then, unleash a potent offensive wave to eliminate him. With the Abomination out of the way, shift your focus to gaining control of the tower on the right.

Ideally, you’ll have established control over both the tower and the stone before another Abomination spawns. This affords you the opportunity to exert pressure on both flanks as much as possible before you need to defend against the Abomination once more.