Secondary professions for a Paragon

Paragon Warrior
A Paragon/Warrior can act as an effective healer and buffer to the team, using chants like Ballad of Restoration', refrains like Mending Refrain, and shouts like "Watch Yourself!". Using these together, along with Signet of Synergy, and other paragon skills, a Paragon can be an effective group healer as long as his allies are around him.

Paragons only have two pips of energy regen, but Leadership can make up for the energy spent in Chants and refrains. If you are low on energy, use "Watch Yourself!" to generate some free energy. When using Mending Refrain, use a cover chant to keep it refreshed, such as Anthem of Flame.

Try to use a low level tactics skill, so "Watch Yourself!" expires faster, refreshing Mending Refrain and triggering skills like Finale of Restoration much more easily.

Paragon Ranger
Rangers add Apply Poison, plus several Beast Mastery skills such as Tiger's Fury that could increase paragon damage.

Paragon Elementalist

 * One good way to use the combo is by Burning Use alot of skills that cause burning then use "They're on Fire!" to not only reduce damage caused by the enemy but to make them literaly, on fire.

If you have Factions a good skill to invest in is Burning Speed this will set a group on fire for 3..8 seconds.

Paragon Mesmer
Mantra of Inscriptions combines well with Cautery Signet and Signet of Synergy.