Harold is a boss pet acquired by completing the

This page is up to date (v1.3.1).
TotH.svg Harold
Harold
Pet ID: melvorTotH:Harold
Source:
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Throne of the Herald
Drop Chance: Guaranteed after 1 clear
Effect: +5% Accuracy Rating
+5% Global Evasion
+2% Chance to Double Items Globally
-0.1s Attack Interval
+3% Chance To Preserve Potion Charge
+5% Global GP (except Item Sales)
+5% Global Slayer Coins (except Item Sales)
+5% Mastery XP in all Skills
+3% Chance to preserve Summoning Charges
+2% of Maximum Hit added to Minimum Hit
-0.2s Monster Respawn Timer
-2% Interval for all Non-Combat Skills
+3% Ammo Preservation
+3% Rune Preservation
+50% Mastery Pool XP Cap
Part of 100% Completion: Yes
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Throne of the Herald

. Unlike most other Boss Pets, the chance of receiving Harold is not random. Instead, he is guaranteed to be unlocked after the dungeon is completed.