With full Item and Full item courier cant kill the boss. Just the last boss can kill me so imba.

u just need the right item build my friend

there are plenty of items with good effects like healing reduction , auras , and other debuffs , items that prevent your death , swap them around use them on courier etc.

beat final boss normal mode with 5 different heroes
just need good random abilities or broken heroes like Shadow Demon

nah fam you just have to pick only few heroes which is viable in this game + good rng ability and then go only one item build and then just dodge everything the boss is throwing at you while removing your abilities while hoping to get his hp down before his gold ring comes back up but WAIT if you dont go the correct items since minute one you will lose it is as simple as that to win the last boss what are you talking about?

beat aghanim with so many different builds and heroes, even with summons like a brood, it may seem limited to something but the more you learn his weakness and strong points the more flexible you can be with your build and heroes. like even oracle can be top dps and beat him ... if you don't believe check discord for prints.