Dlarimit

1 point in Coven adds a huge amount of DPS for 0 mana and 0 upkeep. 

I would only not get one point in Coven if you were playing a very high AoE team (TB/Occ). Even against Queen Coven is useful because of Bite + Nightcrawlers breaking shields quickly. 

That said, it's not necessary to get multiple points of Coven against most matchups. 

This is basically one of the builds I use for Erebus. If you don't need to do a whole lot of DPS having higher levels of mass charm early is very nice for support play. It just really depends on your teammates DG's/playstyles and your opponents DG/playstyles but over all going Coven is a much safer place to go with Erebus. If you ever need to see some rediculous erebus play watch any replay with Renz playing erebus and how patient and perfect he plays using Coven.

http://www.gamereplays.org/demigod/replays.php?game=51&show=details&id=168669

this is a 1v1 my UB vs Renz's erebus. Its not the exact way renz plays in 3v3 or 2v2's but its a very effective way to play vs UB. This game was insanely close.

I like Erb much more than Oak. He's much less annoying. Yes, very safe and survival-oriented, but no silly crap like invincible Shield III + whatever. Yeah, yeah, a good DA in a non-laggy match can counter this somewhat, as well as a good Sedna, but there is, like, 1 DA/Sedna per 10 matches I play. Plus, Sednas aren't usually all that good (= use Silence in weird ways). So if I am playing a safe DG, I want to feel I contribute to his being safe somewhat (well, at least by precise mana calculations), and it's not just the inherent properties of his skills that make him idiotically untouchable. 

Re-thought it a bit. I use Mist only to rinse negative effects, so no need to invest in it so heavily 12-15. Bloody Haze bonus sounds nice in theory if you need to help the ganked teammate, but I find myself just porting in, Mass Charming, then Biting the fastest pursuer, and either Bat Swarming the hell out of there or staying to fight the gankers. No Mist involved in any scenario. My Erb-fighting experience also tells me that Erbs that tend to use Mist as an escape mechanism are usually brutally raped by the whole opposing team after their mana runs out. PB tree at least gives a nice hps bonus and +10% life steal in 20 y radius. Dunno, maybe I'm totally wrong on this one, and Erb's skill is measured by his ability to use Mist efficiently, blah-blah-blah...   You tell me if that's the case, yes? 

1. Bite 1

2. MC 1

3. Mist 1

4. Bite 2

5. BS 1

6. MC 2

7. Bite 3

8. MC 3

9. SAVE

10. Bite 4 / BS 2

11. MC 4

12. PB 1

13. PB 2

14. SAVE

15. Muddle / Vampiric Aura

16. BS 3

17-20. Either Mist tree or Coven tree, whatever will please doggu more!

Not exactly something to do all the time, but a good alternate use.

Indeed, thank you. Allows for interesting mind games, especially if the battle involves some Rooooooooooooks (=highly impaired vision/reaction time).

Yeah.  UB is the number 1 reason I pick up mist if I do.  Actually, ub is the only reason I ever pick up mist.