Strength

is one of the eleven core player Statistics. It plays a major role in determining the damage dealt by the player.

Increasing Base Strength
At the start of the game, players have a base of 0. It can be increased by:
 * Leveling the Foraging skill
 * Turning in Fairy Souls to Tia the Fairy
 * Obtaining the Forbidden Strength upgrade in the Wither Essence Shop (from Malik in the Dungeon Hub)

Increasing Bonus Strength
There are several ways to gain additional bonus.
 * Certain Weapons
 * Certain Armor
 * Certain Accessories
 * Certain Pets
 * Reforging items
 * Strength Potions
 * Weird Tuba
 * Training Weights
 * Wood Singularity
 * Power Orbs
 * Mana Flux
 * Overflux
 * Plasmaflux

Formula
As of the ender slayer update, the simplified formula for damage is:

$${\left\lfloor{\left(WeaponDMG + 5\right) \times \left(1 + \frac{STR}{100}\right) \times \left(1 + \frac{CritDMG}{100}\right) \times \left(1 + \frac{\text{Additive Multiplier}}{100}\right)} \right \rfloor = \text{Damage}}$$


 * WeaponDMG: weapon's damage stat
 * STR: strength (including base strength)
 * CritDMG: critical damage stat (including base critical damage)
 * Additive multiplier: combination of boosts from abilities and enchantments

History
力量