liao1994's page

https://www.d20pfsrd.com/magic/all-spells/f/freezing-sphere/
https://www.d20pfsrd.com/magic/all-spells/d/disintegrate/

The other way is have one party member ready action everytimes the spell caster is trying to move it or before he cast it and hopefully the caster wont succed concentration dc.

if you somehow get caught in one and you are a wizard with teleport specialization, and can always teleport yourself out with shift(su)

https://www.d20pfsrd.com/magic/all-spells/m/mind-maze/
would be pretty funny if you get the spellcaster to walk into his own sphere, and if he fails his concentration to dismiss it.

https://www.d20pfsrd.com/magic/all-spells/c/control-water/ will also make it go away

One interpretation is that since it was ruled that spellcasting creates 'visible manifestations', you always give away your location if casting while invisible (because there'll be a cloud of magic sparkles in the air). Which reduces the ability of wizards to abuse their power, so it's probably good for game balance.

The wizard can move after casting, so it's still not going to be easy to catch them.

When cast, spells have distinct manifestations—whether visible or not—and people especially skilled in spellcraft can identify a spell simply by observing the spellcaster's actions.

Thats based on spell casters movement, and verbal component to know what spell is based on the spell caster, and if the enemy has detect magic or arcane sight so you can watch it based on the magical aura. (by then you know the exact spot since you see or detect the magic aura of invisiblity spell coating a location)

manifestation on spell would also vary, like reduce persons plain manifestation without magic sight would be V,S and the result of the person getting smaller, and since your are invisible, people won't see you getting smaller, but the fireball shotting out of you finger pretty much give away your location instantly (also breaks invisiblity if it's not greater)

which is also the reason why I put an example spell we can work from :)

Remember it's not always free to make a perception check

Most Perception checks are reactive, made in response to observable stimulus. Intentionally searching for stimulus is a move action.

Retry? Yes. You can try to sense something you missed the first time, so long as the stimulus is still present.

That makes since,

under the table for invisiblity in combat as wizard doing spell casting.

The base DC to detect the presence of active invisible creature is DC20 and DC40 to pinpoint location.

In combat or speaking -20

source for invisbility rule:

Scenario 1: casting spell using SA (reduce person).

Scenario 2: casting spell using 1 round (summon monsters).

Question 1: Since I'm both in combat and speaking due to verbal component
is it -20*2

Question 2: What is the DC for finding exact location during both scenarios, since in one of the scenarios the wizard is technically not speaking when it's the enemies turn to use a move action to detect the wizard?

I'm a wizard with invisibility holding a wand. Given I have a unseen servant can I have it hold an item for me and hold it so it's attached on my forearm (like an invisible rubber band with a wand in-between) and have it swap what I'm holding in my hand with what it is holding? And how would it work out action economy wise if it is allowed?

I think you're talking about a Rod of Echoing Spell. Here's the feat description.

Echoing Spell doesn't "store" a spell, it just means you don't lose the prepared spell or spell slot when you cast the spell. The Metamagic Rod of Echoing allows you to do this with up to 3 spells per day.

Assuming you are a prepared caster (wizard):

- You use the rod to cast your prepared fireball. You still have that fireball prepared and can cast it again at any point later today.
- However you cannot use the rod on that second casting of fireball (per the feat description).
- If you prepare 3 fireballs today, you can use the rod once on each of them, giving you a total of 3 additional fireballs
- You can use the rod on a fireball, then use it while casting lightning bolt. You still have both spells prepared and can cast each one once more today.

Thanks for the explaination!

Given I cast a Fireball (lv 3 spell), and use the Rod to store another fireball.
Can I:
Senario A:
Cast an another spell then use Spell Echo to cast Fireball again.
Senario B:
Cast another spell (Lightning bolt lv3 spell) and store that spell as well? (1 Fireball + 1 lightning bolt)
Senario C:
Can I use cast Fireball > cast Spell Echo (Fireball) > cast Spell Echo (Fireball) > cast Spell Echo (Fireball)
Senario D:
Cast Fireball > Spell echo (Fireball) > Cast Lightning bolt > spell echo (lightning bolt)