A 3 rank set of aa's (3/6/9) to increase your chance to shrug off a charm by 5,10,15%.
There has been added a set of AAs to resist charm.
Druids should be given two new AAs which are Spirit of Wood and Convergence of Spirits only without the Damage Shield component. The AAs would be no cost and would be at the exact same level that your current Spirit of Wood and Convergence of Spirits are. This would allow druids to choose whether or not to have a Damage Shield with the AA.
This has been done, although they do cost considerable AAs.