My standard builds and explanations(attributes are random):

Core PvE only Arcane Echo 20 2 15 Enchantment Spell. If you cast a Spell in the next 20 seconds, Arcane Echo is replaced with that Spell for 20 seconds. Arcane Echo ends prematurely if you use a non-Spell skill. Nightfall PvE only Savannah Heat 25 2 5 Elite Spell. You create Savannah Heat at target foe's location. For 5 seconds, all nearby foes take 5..20 damage each second and an additional 5..20 damage for each second this Spell has been in effect. (Attrib: Fire Magic) Core PvE only Glyph of Elemental Power 5 1 5 Glyph. For 25 seconds, your elemental attributes are boosted by 2 for your next 10 Spells. Prophecies PvE only Searing Heat 30 2 15 Spell. Cause Searing Heat at target foe's location. For 5 seconds, foes near this location are struck for 10..40 fire damage each second. When Searing Heat ends, foes in the area of effect are set on fire for 3 seconds. (Attrib: Fire Magic) Eye of the North PvE only "Finish Him!" 15 10 Shout. If target foe has less than 50% Health, that foe takes 20..80 damage and suffers from Cracked Armor and a Deep Wound for 5..20 seconds. (Attrib: Norn rank) Prophecies PvE only Meteor Shower 60 5 25 Spell. Create a Meteor Shower at target foe's location. For 9 seconds, foes adjacent to that location are struck for 7..112 fire damage and knocked down every 3 seconds. This Spell causes Exhaustion. (Attrib: Fire Magic) Eye of the North PvE only Air of Superiority 20 5 Skill. For 10..30 seconds you gain a random Asura benefit every time you earn experience from killing an enemy. (Attrib: Asura rank) Core PvE only Fire Attunement 45 2 10 Enchantment Spell. For 36..60 seconds, you are attuned to Fire. You gain 1 Energy plus 30% of the base Energy cost of the Skill each time you use Fire Magic. (Attrib: Fire Magic) Eye of the North PvE only Light of Deldrimor 20 ¾ 5 Spell. All foes in the area are struck for 40..80 holy damage. The location of hidden objects are briefly indicated on your Compass. Any hidden objects in the area are revealed. (Attrib: Deldrimor rank)

nuker

No real need for an energy management aside from  with this: things die too fast. a mere 25 energy allows you to pump out two . Occasional  against a monk,  to quickly take down a single target(or bosses).

Factions PvE only Animate Flesh Golem 30 3 10 Elite Spell. Exploit nearest corpse to animate a level 3..25 Flesh Golem. The Flesh Golem leaves an exploitable corpse. You can have only one Flesh Golem at a time. (Attrib: Death Magic) Factions PvE only Animate Vampiric Horror 15 3 15 Spell. Exploit nearest corpse to animate a level 1..17 Vampiric Horror. Whenever a Vampiric Horror you control deals damage, you gain the same amount of Health. (Attrib: Death Magic) Core PvE only Animate Bone Fiend 5 3 25 Spell. Exploit nearest corpse to animate a level 1..17 Bone Fiend. Bone Fiends can attack at range. (Attrib: Death Magic) Nightfall PvE only Animate Shambling Horror 25 3 15 Spell. Exploit nearest corpse to create a level 1..17 shambling horror. When the shambling horror dies, it is replaced by a level 0..15 jagged horror that causes Bleeding with each of its attacks. (Attrib: Death Magic) Core PvE only Blood of the Master 2 1 5 Spell. Sacrifice 5% maximum Health. All of your undead allies are healed for 30..116 Health. You sacrifice an additional 2% maximum Health per minion healed in this way. (Attrib: Death Magic) Core PvE only Dark Bond 20 2 5 Enchantment Spell. For the next 30..60 seconds, whenever you receive damage, your closest minion suffers 75% of that damage for you. (Attrib: Blood Magic) Core PvE only Power Drain 20 ¼ 5 Spell. If target foe is casting a Spell or Chant, that Skill is interrupted and you gain 1..31 Energy. (Attrib: Inspiration Magic) Core PvE only Resurrection Signet 3 Signet. Resurrect target party member. That party member is returned to life with 100% Health and 25% Energy. This Signet only recharges when you gain a morale boost.

mm

I hate having the MM being busy doing anything other than creating more meatshields. That's why I have my MM with 4 minion skills, and an energy management for quick energy boost when soul reaping can't give(3 times a given 15sec interval really isn't enough at times).

Core PvE only Empathy 10 2(1.32) 10 Hex Spell. For 5..15 seconds, whenever target foe attacks, that foe takes 15..45 damage. (Attrib: Domination Magic) Core PvE only Arcane Conundrum 20 2(1.32) 10 Hex Spell. For 5..15 seconds, Spells cast by target foe and all adjacent foes take twice as long to cast. (Attrib: Illusion Magic) Prophecies PvE only Ineptitude 15 1(0.66) 10 Elite Hex Spell. For 4..10 seconds, the next time target foe attacks, that foe takes 30..135 damage and becomes Blinded for 10 seconds. (Attrib: Illusion Magic) Core PvE only Cry of Frustration 15 ¼(0.16) 15 Spell. If target foe is using a skill, that foe and all foes in the area are interrupted and suffer 10..44 damage. (Attrib: Domination Magic) Core PvE only Leech Signet 30 ¼(0.18) Signet. Interrupt target foe's action. If that action was a Spell, you gain 3..15 Energy. (Attrib: Inspiration Magic) Core PvE only Power Drain 20 ¼(0.16) 5 Spell. If target foe is casting a Spell or Chant, that Skill is interrupted and you gain 1..31 Energy. (Attrib: Inspiration Magic) Core PvE only Shatter Enchantment 25 1(0.66) 15 Spell. Remove an Enchantment from target foe. If an Enchantment is removed, that foe takes 14..100 damage. (Attrib: Domination Magic) Factions PvE only Resurrection Chant 15 6(3.96) 10 Spell. Resurrect target party member with up to your current Health and 5..35% Energy. This spell has half the normal range. (Attrib: Healing Prayers) Prophecies PvE only Power Block 20 ¼(0.16) 15 Elite Spell. If target foe is casting a Spell or Chant, that Skill is interrupted. The interrupted Skill and all Skills of the same attribute are disabled for 3..15 seconds for that foe. (Attrib: Domination Magic) Prophecies PvE only Inspired Hex 1(0.66) 5 Spell. Remove a Hex from target ally and gain 4..10 Energy. For 20 seconds, Inspired Hex is replaced with the Hex that was removed. (Attrib: Inspiration Magic)

mes supporter

 against mostly attack-based foes,  if going against mostly spell-based foes.  for additional hex removal, such as when doing Frostmaw.

Prophecies PvE only Spiteful Spirit 10 2 15 Elite Hex Spell. For 8..20 seconds, whenever target foe attacks or uses a skill, Spiteful Spirit deals 5..35 shadow damage to that foe and all adjacent allies of that foe. (Attrib: Curses) Prophecies PvE only Insidious Parasite 12 1 15 Hex Spell. For 5..15 seconds, whenever target foe hits with an attack, you steal up to 15..45 Health from that foe. (Attrib: Curses) Factions PvE only Reckless Haste 12 1 15 Hex Spell. For 6..12 seconds, target foe and all adjacent foes are Hexed with Reckless Haste. While Hexed, they attack 25% faster but have a 50% chance to miss with attacks. (Attrib: Curses) Prophecies PvE only Desecrate Enchantments 15 2 10 Spell. Target foe and all nearby foes take 6..60 shadow damage and 4..20 shadow damage for each Enchantment on them. (Attrib: Curses) Core PvE only Suffering 5 1 15 Hex Spell. For 6..30 seconds, target foe and all nearby foes suffer -2 Health degeneration. (Attrib: Curses) Core PvE only Parasitic Bond 2 1 5 Hex Spell. For 20 seconds, target foe suffers -1 Health degeneration. The caster is healed for 30..120 when Parasitic Bond ends. (Attrib: Curses) Prophecies PvE only Blood Ritual 2 2 10 Enchantment Spell. Sacrifice 17% maximum Health. For 8..14 seconds, target touched ally gains +3 Energy regeneration. Blood Ritual cannot be used on the caster. (Attrib: Blood Magic) Nightfall PvE only Signet of Return 20 5 Signet. Resurrect target party member with 5..15% Health and 1..4% Energy for each party member within earshot. (Attrib: Leadership) Nightfall PvE only Signet of Suffering 20 2 Elite Signet. For each Hex on target foe, that foe takes 5..35 damage (maximum 140 damage). (Attrib: Curses) Core PvE only Barbs 5 2 10 Hex Spell. For 30 seconds, target foe takes 1..15 more damage when hit by physical damage. (Attrib: Curses) Prophecies PvE only Soul Barbs 20 2 10 Hex Spell. For 30 seconds, target foe takes 15..30 damage when an Enchantment or Hex is cast on that target. (Attrib: Curses) Core PvE only Enfeebling Blood 5 2 10 Spell. Sacrifice 10% maximum Health. Target foe and all nearby foes suffer from Weakness for 5..20 seconds. (Attrib: Curses) Nightfall PvE only Rip Enchantment 10 1 5 Spell. You lose 15..5% Health. Remove one Enchantment from target foe. (Attrib: Curses) Nightfall PvE only Signet of Lost Souls 8 ¼ Signet. If target foe is below 50% Health, you gain 10..100 Health and 1..10 Energy. (Attrib: Soul Reaping)

ss

 when dealing with hard-hitting foes(bosses and attack-based),  if combining with a MM or attack-based characters.