Secondary professions for a Warrior

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Warrior/Ranger

The Ranger line offers a few alternative IAS skills, as well as a few condition skills, like Apply Poison and Poison Tip Signet.
Troll Unguent is one of the most potent self heals in the game. The elite skill Melandru's Resilience is likewise useful for tanking out conditions rather than worrying about removing them.
The higher energy cost and low skill synergy of most Ranger skills makes this class a better choice after ascending rather than at the start of the game.
Antidote Signet is unlinked, free condition removal.

Skills such as Mending, which has a small return for a high cost of attribute points and Orison of Healing, which is a mediocre heal, should be avoided.
Mending Touch is a useful form of condition removal, even with little or no attribute point investment.
Supporting skills such as Vigorous Spirit provide excellent healing over time when coupled with the fast attack speed of a Sword or Axe. In addition, Vigorous Spirit synergizes well with multiple strike skills such as Hundred Blades, Whirlwind Attack, Cyclone Axe, and Triple Chop.
Succor is quite useful as a party support skill with a build that uses only adrenaline and signet based skills.

The most common usage of the Necromancer secondary is for condition removal via Plague Touch.
Grenth's Balance can be useful in conjuction with max health increases to be able to cause a high amount of spike damage.
Virulence can be used after Sever Artery + Gash to put five conditions onto your opponent.

Wise use of Physical Resistance, Elemental Resistance or elemental mantras can add additional survivability to solo or tanking builds.
The skill Echo, in conjunction with certain warrior skills (such as "Fear Me!" and Sun and Moon Slash), can produce great effects.
Since in PvE enemies tend to "gather" around a warrior, they are often adjacent to each other, making it possible to spread with Epidemic the conditions inflicted by melee skills, and this strategy can be taken even further by using Fevered Dreams.

Shock can be used as a snare and interrupt, however exhaustion will certainly be felt with a Warrior's low energy pool.
Grasping Earth can be used as an AoE snare to keep groups of enemies from kiting as efficiently.
The conjure skills, such as Conjure Frost can provide additional damage when wielding an elemental weapon for a very small investment of energy.
Defensive Earth Magic enchantments such as Obsidian Flesh and Stoneflesh Aura can be used for tanking in high-end areas such as the Domain of Anguish, but maintaining them may require some energy management beyond your normal 2 pips of regen.
Offensive Earth Magic spells such as Aftershock can be used in combination with the Warrior's knockdown skills to wreck havoc among enemies.

The Assassin has a wide range of snares and shadow steps that can serve a Warrior well. Shadow Prison for example.
Signet of Malice can provide free condition removal.
Dash is an excellent speed boost that also serves as a quickly recharging cancel stance for Frenzy.
Death's Charge is useful for closing distance in battle, but take care not to outrun your party's support.
Disrupting Dagger is a useful interrupt which cannot miss or be blocked, although it can be dodged or obstructed.
Shadow Refuge can be used with little to no points because of its high amount of regeneration and low downtime. However, it is only active for four seconds.

Weapon spells can benefit a Warrior; Splinter Weapon can be combined with Triple Chop or Hundred Blades, Brutal Weapon adds overall DPS (especially when combined with the excellent warrior IAS skills), and others can add interrupts or other benefits to attacks.
Various skills can be used in Warrior/Ritualist farming builds.

This combination can be used for the Flail Spear build, using the IAS skill Flail and high attributes in Strength and Spear Mastery to deal damage.
Enduring Harmony can be quite useful for extending warrior shouts such as "For Great Justice!"

A scythe can work in a Steady Stance/Drunken Blow/Desperation Blow build.
Many Scythe Mastery skills are general-purpose Melee Attacks (i.e. Rending Sweep) rather than weapon-specific skills, which allows them to be used with axes, hammers, and swords.
Rending Touch can be used as an enchant removal.
Pious Haste can be used as a cancel-stance for Frenzy.

Secondary professions for ...
Warrior • Ranger • Monk • Necromancer • Mesmer • Elementalist • Assassin • Ritualist • Paragon • Dervish