"AoE" is short for "area of effect," and refers to a class of spells that
influence all the creatures within a set area. It is very important when
using spells of this nature that you fully intend for the spell to impact ALL
creatures in the area that are not grouped with you, including the pets and
minions of those grouped with you.
* Any creature in the area of effect of an AoE spell that is not grouped with
you will be targeted by such a spell, and will likely become hostile to you,
even if it is a pet or minion.
* You can invite the followers of others to join your group, and their
owners/masters can order them to accept such invitations.