The Rugged bronze modification enhances all existing armor values significantly. Combined with Armor Lore and healing from Ancient Bark and other sources, the Dryad can absorb significant amounts of damage.
Depending on the build of the character, the Divert (reflect melee) silver modification can be extremely powerful as game difficulty increases. Not only does it negate a large percentage of incoming melee damage, in harder difficulties the reflect melee effect will reflect thousands of damage per incoming attack. Any character that is frequently in melee range will benefit greatly from this effect.
The amount of healing increases greatly if the character spends a large amount of points on Nature Weaver Lore combined with the Invigorate gold modification, to the point where it can dwarf the healing provided by Constitution Mastery, depending on how skill points have been spent. Combined with Goldenglade Touch and Infusion, the Dryad will heal so fast she can become invincible.
Pros and Cons
Substantial upgrade to armor, bonus healing and reflect damage if the correct upgrade is chosen.
Raises defense value
Strong defensive buff for the Dryad
Decreases the dependence on Constitution Mastery for in-combat healing
The fire damage vulnerability can take players by surprise, especially if set ablaze.
Being a buff, it adds a regeneration penalty.
Note: HP Regen values are based on the gold modification thus +3/level. Without the modification they work out to +3 per 2 levels.
A few of the values of Reflect melee post level 10 are approximated, I only had +even values for the CA and thus split the difference between levels.
Note: Values in Evasion are separated by a slash to distinguish between the +evasion in Σ and the evasion listed under your left-click attack. The first value is Σ and the second is the actual in game value when no evasion gear is equipped.
NOTE: Ancient Bark's visual appearance has been changed over the times with the introduction of a different skin by the CM Patch. This change was introduced in CM Patch 1.20 and brought the dark purple shade appearance that can be seen in the photos below.