- get more mana,
- more heatlh means more priest healing means less damage from kiting
- 4+ mana is not so much. Health will stack with priets.
- More hp means you survive longer so more time to bat away. But really if you are in trouble as erebus you probably overextended yourself.
- More hp means you can just walk out.>.>
Blood of the fallen:
- Get more health
See, I can do it too. More health is a lot easier to get than a warpstone with passive mana benefits starting from level 1 though. Oh, and +4MP/sec isn't much? That's about twice your base regen starting out, and again it stacks with + % mana items...
And, as mentioned (twice) more mana -> more bites -> more health anyway...
We can agree to disagree about whether BotF or Cloak is better with erebus, but to say Cloak is the worst item is a dramatic overstatement and just plain wrong.