Innate Spellcaster(X) is an extremely rare and powerful ability. It allows a mage will be able to cast X more spells per round in addition to his normal actions. Likely due to implementation considerations, innate spellcasters have several other unusual features:

• Innate spellcasters cannot be disrupted and prevented from casting spells by being damaged. Additionally, they can make melee attacks with no delay in their spellcasting, like a far better version of combat caster.
• Innate spellcasters disregard spell casting times, effectively casting all spells at the same 100% rate. This can be very powerful when casting battlefield spells with a high casting time.
• Innate spellcasters cast their first spell effectively in round 0 of combat, before any other spells are completed.
• Innate spellcasters who are masters in a communion pass on double the fatigue to the communion slaves. An innate spellcaster can never become a communion slave.

The casting time features mean that Innate casters can do various unbalanced things, like casting extremely slow endgame spells like Master Enslave or Army of Rats on turn 0 (leaving no opportunity for an opponent to cast Antimagic).

In Vanilla Dominions, innate spellcasters are extremely rare.

• Immobile pretenders like the Monolith, as well as mobile statues like the Bronze Colossus.
• Nazca mummies, such as the Royal Mallqui.
• Immobile mage summons, like the Telestic Animate, Jinn Block, Hamadryad, and Treelords.
• Endgame monsters, including some Horrors and the Legion of Gods.
• The EA Pangaea hero Blessed couple.