Make your way to the Ultragungan battle droids that are around 100 meters from the Gungan Sacred Place Point of Interest. These droids are around CL20.
/way naboo -1822 -5314 Ultragungan Battle Droids;
You will need to
loot an item from these droids. Keep killing the droids until you loot
An Old Gungan's Soggy Journal.
Once you've looted it, return to the Old Gungan.
/way naboo -2134 -5428 An Old Gungan;
You will need to
open your inventory and drag An Old Gungan's Soggy Journal onto the Old Gungan.
Once you've successfully done this, the quest will complete. Speak with the Old Gungan again to progress the questline.
An Old Gungan: Heysa lookey at dat. Meessa journal! Yousa bein my hero!
You: Yes those ultragungans had it after all. So what can you tell me about that big battle on Naboo? What happened there?
An Old Gungan: Let meesa see here. Okie day here is da page. Ohhh, big boom-boom! Gungans fight droids, make lotsa noise! Lemme see, lemme see... (rustling sound) Ah, here it is! Gungans and Nabooians join forces, beat droids at their own game!
You: Wow, sounds intense! Were there any people using the Force or anything during the battle? I heard Jedi were supposed to be there.
An Old Gungan: Jedi, Jedi... Ah, yes! Jedi come swing lightsabers, like whoosh-whoosh! My journal says... they save the day, they do! And lookie like there beesa one baaad bad Jedi with red face.
You: Nice! So, where can I find more of these Jedi folks?
An Old Gungan: Hmm, Jedi hard to find dese days. Me tinks most of dem gone by now or beesa hidin. But I did be hearin of some Jedi on... (whispers) Dathomir...
You: Dathomir you say?
An Old Gungan: Ohhh, spooky place! Meesa never gonna be dere oh no! But I be hearin there be witches there and use Force, do magic tricks! They call themselves... Nightsistas!
You: Witches? Like spells and stuff?
An Old Gungan: Yes, yes! Dey not like Jedi, but dey be doing magick. If you be goin dere you be da most carfuls you hearin me?