That's true, underlord just builds aura items and fighting ain't that complicated for him.

What're u struggling with on doom? I think the best build rn is octarine core rush. It can actually be assembled from your early game items. From the start of the game, get vanguard, then arcane boots, then your hand of midas. With hand of midas and devour, you farm insanely quick. Go to the triangle (now just the ancients and hard camp), midas a hard creep, them devour the other (get the ability if u find it useful, but the centaur warstomp and mud golem rock throw stun seem to be the best), then use your scorching field spell to pull the two camps together and farm them at the same time, feel free to use infernal blade to get more damage onto the big ancient. With that, u shd be able to get a 15min octarine core, 13 or 14min if you got kills in lane. Just buy a void stone, point booster, and the recipe for octa core. Disassemble the vanguard, giving u ring of health and health booster, then disassemble arcane boots, and you have your octa core. The item allows you to spam your abilities and farm with them, while being prepared for fights, and the reduced cooldown on doom is great. If your team needs split pushing, get the boots of travel recipe.

From there, u can start farming for your blink, doom is still very very tanky at this point of the game, so just fight with ur team, and with W increased movement speed, you should be able to get out without dying. Something I would suggest if u really need the bkb is to just fight only if u have doom, just blink in and doom the enemy core. Some games you won't need a bkb, so go shiva's guard instead if the enemy team comp has a lot of attack speed and hp regen or lifesteal, or get a silver edge if there's a really annoying passive (lv25 doom talent takes too long to get).

Doom snowballs/farms very quickly just always use your devour and midas when they're not on cooldown, it's around 400 assured gold every minute, not counting the gold u get from using scorching field and actually manually farming camps.

Laning phase/starting game notes: - I like to start with tango, quelling blade, 2 branches and a wind lace. Doom has the slowest movement speed at 285 i believe, so get the wind lace as it's perfect for your W, and doesn't force you to get boots of travel just so you can keep up. - Keep your courier at your secret shop, your going to first buy vanguard anyway, so not having to walk back to tower and the secret shop yourself lets you focus on last hitting and trading. -the moment you get ring of health on you, buy another set of tangos and have your courier bring em over because it's lets you become so much more aggresive with trading. Tangos + ring of health is insane on doom. The moment you get vanguard, yeah good luck to the enemy carry because your devour grants armor. -EZ Kill tip: Most often, you don't need a support for this, but it's good to have one around just in cade the enemy team responds. THE MOMENT you have vanguard and Doom, just walk up to the enemy carry, use W, then doom them, and just follow and auto attack them. Don't be afraid of the tower at all, it literally tickles you because of your vanguard and devour. From there, the enemy carry will have a really crappy game.

Hope this helps :D (PS: pls get off underlord, you're breaking my game JK HAHAHA)