This is something I learned from my time on Tallon Zek but is quite useful here on blue.
Ever needed to train to zoneline in Unrest when a ghoul roots you, resulting in instant death? Rooted by a caster mob with adds barreling down on you? Save yourself an unnecessary death by carrying Pumice! For just 15pp this vendor bought item can save you from a whole host of nasty situations. Especially nice for classes that don't have dispel options like Warriors, but really good for everyone since you won't always have dispel memmed.
https://wiki.project1999.com/Crystallized_Pumice
It's saved me a bunch of times now and I never hear anyone talking about it. Trust me you'll be so happy when you spend just 3 plat to avoid a corpse run.
It's sold in almost every city so easy to stock up when you're banking.