They are not immune to magical sleep, nor resistant to charms. Wood Elves don't suffer difficult terrain except for underwater. They learn Druidcraft, and may cast both Commune with Plants and Pass Without Trace each once per long rest.
Culture
They have adopted the 'way' of Eladrin Elfs of keeping trinkets, but unfortunately since on the material plane, not used for currency but is some of the few possessions that they can keep unless it is directly assigned from their work or something that they've scavenged for themselves. Most things shared are basic materials for mending, cooking, house & building, and of course, phrax crystals.
While coveted, Eidolon (if obtained) are usually put to work on manual labor and defense as it is difficult to obtain any with "modifications" as the Eidolon technology isn't colloquially a practiced "art."
Phrax Crystal
They tend to actually go for the less refined Phrax Ores and not the refined crystals as their woodland magics are able to interact with phrax crystals in a different way allowing similar longevity as a processed Phrax Crystal. But with the ability to recharge most enchanted or imbued objects utilizing phrax ore.
History
Wood Elves, whilst not High Elf, would be caught in the crossfire of everything. Drow attacks, some political scandals from High Elves, an disdain from Humans. They have grown to covet and secure what they have, usually amongst their peers and peoples.