Hexdrinker

Gold 1300
Increases Attack Damage and Magic Resist

+20 Attack Damage
+35 Magic Resist

UNIQUE Passive - Lifeline: Upon taking magic damage that would reduce Health below 30%, grants a shield that absorbs 110 to 280 (based on level) magic damage for 5 seconds (90 second cooldown).
Builds From

Long Sword Slightly increases Attack Damage 350 Gold Null-Magic Mantle Slightly increases Magic Resist 450 Gold
Builds Into

Maw of Malmortius Grants bonus Attack Damage when Health is low 850 Gold