Bloodseeker - a short essay on how to fly

1.4 * 1.4 = 1.96. It's multiplication not addition.

Otherwise yes, dagon Bloodseeker is legit because of the damage amplification and the fact that BS can get one very early (and it's coming from me who always keeps saying that dagon any hero that isn't Tinker, Furion or Nyx is a garbage build so that's saying something).

...just obviously you can't do this build if you're your team's main carry, there's a lot of safe lane BS these days and on a safe lane BS right-click items are the norm.

I´m not good at math somehow double bloodrage seems to give 96% more damage and not 80%

Dagonseeker is legit. Bloodrage yourself, Bloodrage your enemy, Eblade them. Dagon them.

Ethereal Blade Damage:
At LV.25, Bloodseeker has 99 AGI with no items.
(99*2+75) * 1.4(Bloodrage#1) * 1.4(Bloodrage#2) * 1.4(Ethereal Blade amplifies it's own damage) = 749 Magical damage (Approximately, the actual value depends on your current AGI. 99 is just a very approximate guess.)

Dagon(5) Damage:
800 * 1.4(Bloodrage#1) * 1.4(Bloodrage#2) * 1.4(Target is ethereal) = 2195 magical damage

749 + 2195 = 2944 Magical damage

2944 * .75(Normal magic resistance) = 2208 damage

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2208 damage is insane. You turn into a better Morphling. Indeed legit. I rest my case. You can also buy a Veil of Discord or a Orchid Malevolence to make it even MORE fun. Dagon into Ethereal Blade is actually viable.

I'm glad that you included Dagonseeker in the guide. I really like it, +1. The formatting is good, the build is good, and the explanations are good. I can't really find anything wrong with it.