Zir Zeal is a variant of Sir Seal, and is Zombie-type. He has much higher attack and health than the regular Sir Seal, but otherwise has similar stats.
Because he is a Zombie enemy, he has the typical burrowing and respawning abilities of Zombie enemies. However, when Zir Zeal burrows, he takes its sweet time to dig a huge 1500-length tunnel underground, longer than the standing ranges of any cat unit. Consequentially, Zir Zeal tends to overshoot the blindspots of Long-Distance cat units and will actually not pose an immediate threat to your backline. Furthermore, due to the massive length of his burrow, Holy Blast is, as expected, an incredible asset against him.