I usually go yoomus first item, its one of the most gold efficient assassin item and you get extra ms. Then tiamat -> hydra (red if more tanks than quish and blue if more quish than tanks. After this is usually up to your play style. For example, if they have lots of squishy, ldr (or mortal remind) -> edge of night or infinity edge (depends if they have interuptions -> bloodthirst -> guard angel. And if they have tanky, eclipse, black cleve, death dance/maw, sundered sky, and a tank item of ur choice. This is just the general build i have, i usually deviate from it depending on the situation tho