Screenshots, because i'm lazy

"It's handy, when you have an invisible pet minotaur in a dungeon full of trolls and bugs"
[spoiler] [/spoiler]

"Being first level in an experienced party makes you not unuseful. Wisdome doesn't come automatically with experience."
[spoiler] [/spoiler]

"An invisible cleric is also useful, when dealing with undead. In case of Uncle Marthur it's not clear that the walking corpses are run away from him because of his divine might or the alcoholic vapour, that surrounds him, but his method is effective nonetheless."
[spoiler] [/spoiler]

"You forgot to memorize dispel magic? Use invisibility instead!"
[spoiler] [/spoiler]

"When you are overwhelmed by enemies, use your charm to even the odds!"

[spoiler] [/spoiler]