Intro Greetings, all! I originally posted this as a reply to the Marshal Base Class thread, but I reposted this here for the sake of convenience. Spell-like Abilities, Metamagic, Warlocks, and Dragonfire Adepts By the rules as written, SLAs are effected by metamagic that specifically affects SLAs: Quicken SLA, Empower SLA, Maximize SLA, etc. These SLA metamagics require a specific caster level (not spell level) to use. Warlock invocations and Dragonfire Adept invocations use a similar system: All invocations are SLAs that come in 4 grades (least, lesser, greater, and dark) and all have a spell-level equivalent (like level 1 for Eldritch Blast - see errata) but aren't spells. Factotums A Factotum's spells are prepared as spells with spell-based metamagic, but cast as SLAs. Spellthieves A Spellthief can steal spells and cast them as spells then later steal SLAs and cast them as SLAs. If a stolen ability was metamagicked, the Spellthief casts that ability with the same metamagics. Tome of Battle's Martial Adepts AKA Initiators and Metamagic Tome of Battle's base classes (martial adepts AKA initiators) have maneuvers and stances. These have levels (1-9) and require specific actions to initiate. Unlike spells, stances are usable at will and maneuvers can be recharged throughout the day, even mid-battle. Each maneuver's refresh mechanic depends on the class that readied this maneuver (Crusader, Swordsage, Warblade), and by RAW, only one class may know a maneuver at a time. (Thus, a Crusader/Warblade can only know Stone Bones as a Warblade maneuver or as a Crusader maneuver.) All maneuvers are (Ex) or (Su). Tome of Magic has various metamagic feats for supernatural abilities: Empower, Maximize, etc. but nothing for (Ex). Tome of Magic has these feats because another base class (Tome of Magic's Shadowcaster) uses supernatural abilities.