Versions

• Minecraft: 1.12.2
• Forge: forge-1.12.2-14.23.3.2655-universal
• Vampirism: Vampirism-1.12.2-1.4.1

Upon placing the Blood Pedestal in the world the game instantly locks up and crashes.

Place a Blood Pedestal in the world

https://pastebin.com/QJGcvgGh

The mod is compiled in the modpack Mech & Magic on the ATLauncher
https://www.atlauncher.com/pack/MechMagic

Thank you for reporting. Will be fixed in the next release (probably in a couple of days)