My favorite character of recent history was the first artificer I ever played, chaotic neutral Alexander Bolghan Bindo.
I played him from level 1 all the way through level 20.
He was introduced as an eccentric blacksmith who had traveled a long distance and set up shop in the party's home town. The earliest sessions were spent hiding behind the party, doling out infusions, and crafting mundane equipment for them to use, which made him extremely popular.
Once he got beyond level 9 or 10 he quickly took over the campaign in terms of power. He was literally showered with hundreds of pieces of magical equipment from an invading army we dismantled, nearly all of which was given to him to break down for craft reserve. We had also house-ruled that the craft reserve doesn't empty when he gains a level. The very next thing that happened was a time-lapse of nearly three years while certain events took place that we would have to deal with.
I spent the entire time building. I created hundreds of scrolls, dozens of wands, and equipped the entire party with everything they wished to have. It was an unfortunate case of the DM not fully understanding the implications of what I could do with time and money.
I remember one session in particular towards the end of the campaign when Bindo got
really pissed. The DM thought it would be a neat way to get the party involved by having an invading army burrow under the town and partially collapse Bindo's workshop. Bindo was not pleased, and cleared several tons of earth to gain access to the tunnels. The session was set up as a gauntlet run, with several encounters one after another designed to steadily drain resources so the BBEG could finish us off.
It did not.
One of the later encounters, Bindo was so frustrated that he opened the encounter of eight sizable enemies with a Celerity (from his staff) + Forcecage (from the scroll in his other hand). The rest of the party just sort of stood there holding actions until he recovered. The next round he had his spare hand pass him his other scroll, and he fired off an Extended Acid Fog. Then started marching past the cage as the enemies began choking and gagging.
Bindo: "Encounter handled. Moving on."
The party: "But... they aren't dead yet..."
Bindo: "They will be soon. They're very ill."
DM (OOC): How long did you say that Acid Fog would be?
Me: 34 rounds. 68d6 of Acid damage total. No Save. No SR. Moving on.
DM
: ...And the Forcecage?
Me: DAYS! MOVING ON!
The rest of the group kind of gave him a look, "That was a little dark, man..."
Bindo: "Don't fuck with my workshop."
He actually end up surviving a TPK at the very end of the campaign by plane shifting out when he realized the entire party was dead. Since it was an apocalyptic event, there was really no point in trying to ressurect anyone and the campaign ended on kind of a downer, but it was a great ride while it lasted. And a mentally unstable artificer with almost limitless resources makes for interesting plot hooks for future campaigns.
Nigh-infinite power is a hell of a rush. Definately something I would recommend everyone try at least once.