The Corrupted Cat Base (黒ネコの城 Kuro Neko no Shiro - Black Cat's Castle) is a unique enemy base found in the Day of the Cat event.
Similar to other "animated" bases, this base is immune to all effects (Slow, Stop, Knockback and Weaken), plus an ability to do a very long Shockwave attack if a cat steps in its range. It is similar to the normal Cat Cannon.
This base's Shockwaves can cover the full map in the second and third stages, 85.35% the length of the first stage.
Its health is visible to see like all other enemy bases.
Trying to stall the Killer Cats outside of the Corrupted Cat Base's range to avoid the Shockwaves is the best idea.