Beards of Crowglyph is an epic elder that spawns more elders when it is damaged. Its strength can be increased by leveling it up. Beards of Crowglyph is a durable unit that will often take multiple cards to completely remove from the board.
If not dealt with properly, Beards of Crowglyph will spawn more units for your opponent to deal with.
Increasing Beards of Crowglyph's strength with cards like Potion of Growth will not only make it harder to remove completely, but also increase the average strength of the tokens it spawns.
Damaging Beards of Crowglyph by a large amount will be effective as it will either destroy them outright, or make them spawn a very weak unit.
When playing against Beards of Crowglyph, you can try to block off all tiles bordering it so it cannot spawn anything.
After surviving damage, spawn an Elder with strength equal to this on a random bordering tile.