Cosa accade nel caso di un incantesimo d fuoco che viene lanciato in acqua? Ha effetto? Ho notato che nella descrizione degli incantesimi di fuoco, solo in alcuni (non in tutti) viene detto "non funziona in acqua". Come mai? Forse sott'acqua gli incantesimi istantanei come palla di fuoco funzionano, mentre quelli che creano fiamme continue come "muro di fuoco" non funzionano?

Cosa accade nel caso di un incantesimo d fuoco che viene lanciato in acqua?

Questo:

Underwater Combat

Land-based creatures can have considerable difficulty when fighting in water. Water affects a creature’s Armor Class, attack rolls, damage, and movement. In some cases a creature’s opponents may get a bonus on attacks. The effects are summarized in the accompanying table. They apply whenever a character is swimming, walking in chestdeep water, or walking along the bottom.

Ranged Attacks Underwater

Thrown weapons are ineffective underwater, even when launched from land. Attacks with other ranged weapons take a -2 penalty on attack rolls for every 5 feet of water they pass through, in addition to the normal penalties for range.

Attacks from Land

Characters swimming, floating, or treading water on the surface, or wading in water at least chest deep, have improved cover (+8 bonus to AC, +4 bonus on Reflex saves) from opponents on land. Landbound opponents who have freedom of movement effects ignore this cover when making melee attacks against targets in the water. A completely submerged creature has total cover against opponents on land unless those opponents have freedom of movement effects. Magical effects are unaffected except for those that require attack rolls (which are treated like any other effects) and fire effects.

Fire

Nonmagical fire (including alchemist’s fire) does not burn underwater. Spells or spell-like effects with the fire descriptor are ineffective underwater unless the caster makes a Spellcraft check (DC 20 + spell level). If the check succeeds, the spell creates a bubble of steam instead of its usual fiery effect, but otherwise the spell works as described. A supernatural fire effect is ineffective underwater unless its description states otherwise. The surface of a body of water blocks line of effect for any fire spell. If the caster has made a Spellcraft check to make the fire spell usable underwater, the surface still blocks the spell’s line of effect.

quindi bisogna fare una prova per farli funzionare, tranne se dice che non funziona proprio?

bisogna fare una prova per farli funzionare, tranne se dice che non funziona proprio?

Si.

Steam Magic (Stormwrack) permette di castare incantesimi con il descrittore del Fuoco sott'acqua senza effettuare la sopracitata prova.