If you want to challenge the present rate, posting some old discussions about it would help.
These aren't classic, but from 2003 where there Would be some better spells and gear.
"Sorry to bump the somewhat old thread, but rather than starting a new one it seemed appropriate to reply again here.
On my third try I managed to solo Cazel. I would estimate his regen to be around 100 hp a _second_ (especially obvious now that target hp is updated every second). This made even chain nuking with Winter's Frost impractical. However, from my days as a monk using an adamantite bo stick, I remembered a nifty property of large mobs: Cazel's melee range is larger than my rain's radius. So I was able to stand at near max melee range and alternate Winter's Frost with Winter's Storm without hitting myself, and without being summoned (which would interrupt a spell). Once he started running away I had to burn him down with just Winter's Frost; each cast would do about 12% damage, but he'd regen about 8% between casts. I finished with near full health (spirit of the wood+replenishment+nature's recovery was enough healing) and about 20% mana."
Source:
http://thedruidsgrove.org/archive/eq/t-2124.html