Grit
active Strong evidence When to buy Grit Grit +60s Cooldown +200 Barrier +1 Out of Combat Regen +4s Barrier Duration
Cheap early answer to a burst-heavy lane; also the component for 
Guardian Ward Guardian Ward +60s Cooldown +0.2s Cast Delay +1.5 Out of Combat Regen +6s Buff Duration +8% Ability Range +8% Radius Builds from Grit , 
Reactive Barrier Reactive Barrier +55s Cooldown +10s Duration +1 Out of Combat Regen Builds from Grit , 
Spirit Shielding Spirit Shielding +45s Cooldown +3.5s Time Frame +225 Damage Threshold +2.5 Out of Combat Regen +8s Barrier Duration +15% Spirit Resist Builds from Grit and 
Weapon Shielding Weapon Shielding +35s Cooldown +4s Time Frame +250 Damage Threshold +2.5 Out of Combat Regen +8s Barrier Duration +18% Bullet Resist Builds from Grit .
When to skip Grit
The barrier needs to be cast before or during the burst, and the cooldown is long.
Problems it answers
- Burst damage — “I die before I can react.”
Heroes that make this worth a slot
Heroes whose kit creates the problems Grit answers. This is derived from kit properties, not from measured build results.