Mortal Reminder

Stats

Values as the League of Legends Wiki's item data lists them, for every mode; the data doesn't state their units.

Attack Damage changed to 40 in patch 26.17 (was 30)³

Effects

• Grievous Wounds (unique): Dealing physical damage to enemy champions inflicts them with Grievous Wounds for 3 seconds.⁴

Arena changes

• Attack damage changed to 30.
• Armor penetration changed to 30%.
• New Effect: If the target heals for a total amount that is over 60% of their maximum health while continuously afflicted with Grievous Wounds, the strength of the healing reduction is increased to 80%.⁵

Attack Damage changed to 40 in patch 26.17 (was 30)³

• Mortal Reminder is recommended when the team needs Grievous Wounds and no one else is building it.⁶
• Mortal Reminder is usually good on Garen.⁷

My Axe's armor shred works with an ally's Mortal Reminder against a champion such as Malphite.⁸

• Mortal Reminder can be effective on champions with built-in penetration, such as Pantheon and Ambessa.⁹
• Mortal Reminder is good, but not always the best choice unless there are a lot of sustain champions.¹⁰
• Mortal Reminder can let an ADC apply antiheal to a target other than the one in front of them.¹¹