Boosts

There are several boosts that can be bought via the in game shop, via third party marketplaces, or by contributing to the Wishing Well. Contributing to the Wishing Well will bestow +XP% gifts once contributions hit certain thresholds, both globally and for your clan (+10% to combat/non-combat/all actions depending on the tier).

The maximum boost currently attainable is therefore +20% from a skill/combat boost, +10% from winning the Wishing Well, +10% from a global boost, +10% from a clan boost, plus any native hero XP boosts.

XP
Combat Boost	Gives +20% to combat XP gained for 24h.
XP Boost	Gives +10% to all XP gained for 24h.
Gathering Boost	Gives +10% in number of items gained from skills for 24 hours.
Skill Boost	Gives +20% to non-combat stat XP gained for 24 hours.
Wishing Well Contribution Boost	Gives +5% to all XP gained for 12 hours after contributing (contributing again in a single day does not give more boosts).
Wishing Well Wish Granted Boost	Gives +10% to all XP gained for 24 hours after having a wish granted (after having contributed the previous day).
Combat Stats
Melee Boost (S)	Gives +10 Melee Attack for 24 hours.
Melee Boost (L)	Gives +30 Melee Attack for 24 hours.
Ranged Boost (S)	Gives +10 Ranged Attack for 24 hours.
Ranged Boost (L)	Gives +30 Ranged Attack for 24 hours.
Magic Boost (S)	Gives +10 Magic Attack for 24 hours.
Magic Boost (L)	Gives +30 Magic Attack for 24 hours.
Defence Boost (S)	Gives +10 Defence for 24 hours.
Defence Boost (L)	Gives +30 Defense for 24 hours.
Health Boost (S)	Gives +65 Health for 24 hours.
Health Boost (L)	Gives +220 Health for 24 hours.