Title: Ruby Warlock health bar

Summary: so when i was fighting the ruby warlock, nether 25 rooms, i trapped him in lava with bone blocks around him and his health bar remained the same (full) until he was dead. 

Priority and Severity: B

Server: DungeonRun

Steps to Reproduce:
1) trap the warlock with bone blocks and cover him in lava
2) watch as his health bar stays the same

Expected Outcome: The health bar is supposed to go down when he takes damage

Actual Outcome: The bar remains full

UPDATE: this bug only happens when you trap him in lava/water and DONT hit him, the bar will jump signifigantally once you do and stay that way, to see how much the health has gone down you have to hit him everytime