Let’s just hope she still has Smite-Slots left!
The game masters player character found the plot device! I call shenanigans!
It’s like Hardness 12 and 2 digits of HP or something. She doesn’t need much to break it.
Unless Dracolich boosted it with 3rd party hardening enchantments.
Of course I always liked the lich who used Trap The Soul on The Tarrasque and used magic to put his phylactery inside the gem.
PALASMASH!