Project 1999 - Lvl 60 druid SOLO Kills

With powerful clickies like Puppet Strings? Or just Druid charm?

Old World:

Terror/Dread/Fright (1.0 versions without death touches) - Used Puppet Strings, doable a bit more tediously with charmed shiverback. Now not possible anymore cause DTers. Terror might be doable but it would be sketchy.
Estrella of Gloomwater - Charm random piranha or shark, at the end you have to hope your pet interrupts her gate if you pulled her away
Corrupted/Tainted Seahorse - Charm him, have him fight 3-4 AE rooted seahorses, break charm at 3-4% and Wildfire him to death. Summoner so he sucks when he breaks early, and mobs seem to dispell a shitload now so you get charm breaks often.
King Tranix/Warlord Skarlon - Used puppet strings. May be possible with a charmed sonic bat but you would need to slow then with midnight mallet and have them single.

Kunark:

Black Reaver - Puppet Strings'd a pet, easy fight.
Vessel/Verina/Tangrin /Wraith- Puppet Strings'd random guards or NPCs. Enchanter epic mobs, Vessel is probably the hardest of the four.
Bone Golem Cycle - Puppet Strings'd bard NPC at Arena. Necro epic fight in Rathe. Was tough first go round because it aggro locks the spawn trigger and your pet can't pull it off you. I figured out the second time it was easier to egress to clear that aggro lock and send pet in. Much easier that time.

Velious:

Priest XXX - Puppet Strings'd suit of armor and weaponized it. He ended up killing my suit and gating on me at low HP, I had to scramble to find another pet to finish him off. Was a tough kill. You really want to kite him around with MR gear on to burn all his mana before fighting. I think if you could wrangle up 2 haze panthers, you may be able to solo him using two pets if you stuck a midnight mallet to slow him early. (Wakening Lands priests for Druid gloves.)
Staff Sergeant Drioc - Charmed wolf pet blenders through this guy you just have to get one out. I tried root rotting him but he constantly breaks root and has HP regen of around 3-4% a tick.

I think Vilefang is doable with good rat faction, some cure blind/poison clickies and good luck on a snare pull. The rats in there are charmable

I would guess some of the easier WW Dragons are doable with a charmed wolf/mastodon/bronto. You just need to stack a few junk buffs on top of your pet to eat dispells. + Bracer of the Hidden to cover after each dispell.

Random trash in SG are doable charming manatees. The only problem is they are very precarious fights. Once your charm breaks you're basically dead unless you can hop out of the water and recharm quick. They will be RNG rolls on whether your charmed pet breaks early or not. I'm a bit sad the faction in there isn't fixable, I don't really want to ruin my Druid's.

A decent amount of mischief is doable with a charmed skunk pet. Probably everything except Stomples, Puppets and Horses.

Most of Kael trash, even armor dropping ones, are doable if you can get it single, and you can charm a drakkel dire wolf. Again though, charm break and you're likely dead with the wolf and giant beating you up. You have a very narrow window of getting both summons burned and getting out of range to recharm.

In Kunark/Classic, a lot of it comes down to whether you've got puppet strings or not. There aren't too many areas with a charmable animal you can use to take down summoning mobs.

Velious opens up because Kael, WW, SG, DN all have valuable animals you can charm. But as the content gets harder the charm breaks are more punishing. A lot of them are basically, if it breaks mid fight and you can't channel your first charm, you're dead.