my druid is built for dragon slaying. skills i use are fireward(great when u heal a tank with 4 dragontamers around), abundance(best to cast on rogues too stubborn to get hp to at least 2000 -.-), natures touch, group heal, embrace. all maxed.
i rely on other druids to cast other skills.
im not too sure if dragons do pierce dmg or slash, but i cast ward of assassins and ward of soldiers anyway but only 1/30.
can solo heal a good tank on Drake, lvl 90 dragon. and team up with another druid for Ythair (but energy is kinda hard with only two healers on ythair)
if u want to be on boss runs for grommak, ragnok (ragnarok?) and pyrus, ignus, u need ward for giants, fireward, abundance, group abundance, embrace, groupheal(for quakes and also for the firecloak that ignus has), natures touch, bark also helps. i hear ppl say that golems do slash dmg. so i cast it too but skill only at 1/30.
for chained king and emperor, ward of magic (not sure), abundance, natures touch, ward of assassins and other skill u like.
for woodcrown and gnarl, ward of giants, natures touch and other skills u prefer.
for swamplord and swampking, ward of ice, ward of assassins (not sure) natures touch, embrace and other skills u prefer.
for allseeing eye and all knowing eye, ward of eyes (

), and other skills u prefer.
it all depends on what boss u usually kill. or u can collaborate with other druids and decide on specialties. buy alt books if u need to reset skills for different bosses if ur clan doesn't have enough druids. kinda expensive though.