Crossing the Plains of Rhovanion
"The Living Spell had... well, I wouldn't quite call it a personality," Radagast answered the others.
"It is not the first such creature to walk the land, which is why it had the name Plaguire, though I have no idea who gave it to it. Given the nature of the spell, it was probably sent by the Necromancer. Yes, I know, the Necromancer was destroyed. But there have been rumors of a new one who has taken up residence in the Mirkwood. The other Keepers were dealing with that."
"As long as the Plaguire... 'lived', he was contaminating the soil around the Ents, transmitting plague through it. We could forestall further damage, but until after we destroyed the Plaguire, healing the Ents was impossible."
"Once destroyed, though, the Ents were healed quickly."
"We also left a few Keepers with Ents in case some other attack on them was made."
"The best thing we can do for the Ents, of course, is re-unite them with the Entwives."