ToME: the Tales of Maj'Eyal

Goes to projection's inventory, just like Telos, so it won't work on possessor unless someone can find another method of transferring items (which, maybe? If you project, summon golem, get item, give to golem and unproject, the golem will stay and keep the item, but I haven't figured out a way to get it off the golem at that point. Could be worth exploring more though)

A few more observations: traps from cunning/traps and glyphs laid while projected deal damage, healing from affinities is calculated before the damage reduction from projection (most useful with the 100+% ice affinity and ice storm talent from shivgoroth form to get regen on your main body while projecting), shadows are compatible, and for solipsists, inner demons cast while projecting still deal damage, and you can have targets with low enough save pretty much perpetually asleep and summoning demons.

Inner Demons is a good catch. I suspect that means the Nimbus of Enlightenment would also work, which is very strong on paper and a great way of defending your Projection, but it throws error boxes like crazy so is currently unusable.

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My class guides: Possessor, Oozemancer

It's old, but still. You can sell items to merchant for free gold. Not that much of an impact, but still it's infinite gold. When Forgery disappear gold is added to your total.

Tried to make a tinker but it's impossible to get it out of inventory, selling will destroy it basically, you can't buy back.

EDIT: you can place items in a vault though, and the original one remains in your inventory. Again, not that big of an exploit, but still pretty BAD. And yeah, never try to retrieve items from vault as projection, they will just disappear and cause an error.

Allright, so you don't even need Cursed Sentry to dupe items.
Well. That's pretty broken.

Another point, with vault help you can bypass tinker restriction, basically gaining some levels in tinkers with projection, creating corresponding tinker of needed rank and then storing it into the vault to later take it out as a main character. But you could do this anyway if you had at least one dedicated tinker character still alive. Vault use is by itself more broken than most addons are. If there were scoring sistem, vault usage would at least halve your score, I bet.

Thankfully that particular problem can be solved by preventing your projection from accessing vaults/creating tinkers. But other problems still remain.

Ah, and yeah, you can learn recipies this way: by maxing corresponding skill during projection you will get a recipe if you didn't get one before, and it will preserve after projection ends. Again, not a big deal, but still not very good.