To add to that, there's the powerful Fire Elemental which only the Druid can summon without being paralyzed for 3 rounds like mages. It's one of the best summons in the game! B) (View Post)

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At low levels, the shaman summons (that is, what you refer as invocations) are not very powerful and have a low chance to appear, but at higher levels they become much more powerful and have a 75% ch… (View Post)

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Some experimentation shows that you can (with some skill and proper timing) actually move a shaman while he's dancing without dispelling the summons, even in the unmodded game. ;) See here. (View Post)