User is allowed to cast summoning spells. This skill may be acquired either through the use of a talisman or learned via a skill scroll.

Skill is a spell group, and used through the cast command.

Nothing I know of.

You open the guide to the Art of Summoning and start reading.

Basically there are two classes of summoning spells: 1. The golem-like spells summon a creature that will move straight forward attempting to kill any monster blocking the way. 2. The petmonster-like spells are capable of summoning masses of little helpers, fighting for your cause. Use golem-like spells to take down strong enemies. For example: “summon golem”, “summon xxx elemental”, “staff to snake”, “summon avatar”. Use pet monsters to clear out large maps with creatures of decent level (compared to yours). For example: “summon pet monster”, “summon cult monster”, “call holy servant”. As you raise your skill-level, most summoning spells will increase in power. It is probably stupid to use *nothing* except summoning spells. But there are situations where a summoner survives while another wizard would have died. And once you have seen the first Balrog fall to your avatar, there will be no doubt about your power.