Guild Wars 2

what tree does wells benefit from? New player here :p

Blood Magic, and one trait in Curses.

+ Death magic (Protection)

But if you’re talking about damage, the damaging ones scale from power.

Traitwise blood, curses and death magic. But damage wise they scale off power, precision and crit damage.

Wells and the stats that help them:

Well of Blood Conjure a well of blood to heal allies.
(Healing power)

Well of Corruption Target area pulses, converting boons on foes into conditions (Power/Prec/Crit dmg/Cond dmg/Cond duration)

Well of Darkness Target area pulses, blinding foes with each pulse.
(Cond duration)

Well of Power Target area pulses, converting conditions on allies into boons.
(Boon duration/healing power for Regen boon)

Well of Suffering Target area pulses, damaging foes and inflicting vulnerability.
(Power/Prec/Crit dmg/Cond duration)
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Trait-lines with Well specific traits:

Curses
Focused Rituals – Well skills use ground targeting.

Death Magic
Ritual of Protection – Wells apply protection for 3 seconds when cast.

Blood Magic
Ritual Mastery – Wells recharge 20% faster.
Vampiric Rituals – Wells also siphon health every time they pulse.