Health regeneration (HP5) is a stat that determines how quickly a unit's health automatically regenerates, measured in intervals of 0.5 seconds. The regeneration stops when reaching maximum health.

Key Facts:

• Stacks additively (1:1 ratio)
• Every champion has base health regeneration that grows per level (except Briar)
• Counted as healing for modifiers and end-game stats
• Gold value: 3 gold per point of percentage base health regeneration

Sources of Health Regeneration:

Items:

• Doran's Ring
• Doran's Shield
• Guardian's Orb
• Spirit Visage
• Warmog's Armor

Consumables:

• Health Potion
• Refillable Potion
• Total Biscuit of Everlasting Will

Champion Abilities:

• Dr. Mundo's passive and ultimate
• Garen's Perseverance
• Sett's Pit Grit
• Singed's Insanity Potion
• Trundle's Frozen Domain
• Wukong's Stone Skin

Runes:

• Second Wind
• Biscuit Delivery

Neutral Buffs:

• Crest of Cinders

Record Health Regeneration: The highest achievable health regeneration is 19,329 HP per 5 seconds (3,866 HP/second), achieved by Dr. Mundo with specific item builds, runes, and buffs. This setup allows him to recover from 0.01% to 100% health in approximately 4.16 seconds.

Important Notes:

• Health regeneration can be reduced by healing reduction effects
• Revitalize and Heal/Shield Power don't affect health regeneration
• Oceanic Will and Ocean Dragon Soul are separate from health regeneration

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