Sustained laning and trading.
Durability and crowd control
Guard allies you cast spells on and those that are very nearby. If you or a guarded ally would take damage, you're both hasted and granted a shield.
After taking damage from an enemy champion, the next 3 spells or attacks you receive deal less damage.
Start the game with extra health. After 4 takedowns, consume that health for adaptive AD or AP.
Heals and shields are 5% stronger and increased by an additional 10% on targets below 40% health.
30-270 health (at levels 1-18)
Gain a free stopwatch. Stopwatch has a one time use Stasis active.
+5% Max CDR
+5% Summoner Spell CDR
+5% Item CDR
Guardian synergizes fantastically in a duo lane on Morde when paired with your [W] for excellent damage mitigation from ranged poke.
Bone Plating help get your through a rough laning phase where you would otherwise take a ton of incoming poke damage.
Chrysalis' extra early heath further empowers your early laning sustain as well as the extra AP in the mid game pushes you to be a strong teamfighter.
Revitalize's extra healing empowers your [W] for extra lane sustain for both you and your lane partner.
A well-timed stopwatch can be the difference between dying and getting a double kill and snowballing the game. Perfect Timing also helps you hit an earlier Zhonya's purchase.
Cosmic Insight's general utility is incredibly strong and reliable.