Soul Stones are needed to obtain pets and upgrade your habitats. However they are not easy to obtain. You need to farm the dust first to get them. You can get the stone immediately on 4th phase of the pond of souls as a completion reward. Here is the converting cost from dust to the stone.
Gathering Bravery, knowledge, and Unity dust is very easy. You can get them simply by sacrificing any 2 elements pet. Unity dust is more rare than knowledge dust, so you need to sacrifice “rare” 2 elements pet (such as Icicle snowpard, Fruit Boar, etc).
For Shadow and Mystic, you need to sacrifice 3 elements pet…. because 3 elements pets are so rare, I suggest you to max them out before trying to sacrifice them (I suggest you to sacrifice them only when you have the duplicate). Luckily for shadow dust you can get them by banishing the invader (dark pet that attack your village). The amount is small (20-30 dust) but it’s still worth it since sometimes you get gems and other items.
Another great source for mystic dust is your friends. Try to help your friends when they ask a specific monster, the bonus rewards for helping them is a mystic dust. You can also get it by checking the gift box on your friends’s village (15 box per day), you may get it (only 10 dust) or other rewards (such as gems, food, and golds).
You can also get the dust from the detective mission, but I never saw any reward other than unity dust.
Pond of souls have 4 stages. the first three will rewards you with random type of dust (500), I never get any mystic dust from the rewards, so I believe the chance is very small (not evenly distributed; 20% chance each).
The first three have 14 hours refresh time, and 23 hours to complete the task. They don’t ask you to sacrifice any specific monsters (only a certain element). My tips is to pass these stages ASAP (read my tips on the Pond of souls Page; You can train the pet on the refresh time), use any pets which are easy to obtain, these are my recommendation
|Water||Igloo Penguin/Spark Buffalo|
For Ice, Lightning, Air, and Water, I don’t recommend you to use the basic pets, because their hatching time are not differ much from the hybrid pets, and their prices are quite expensive (especially air which can only be purchased by gems). If you have kept duplicated 3 elements pet then sacrifice them on this phase (The game never ask you to use any 3 elements pet on the 4th stage)
Keep your duplicate of the uncommon pets (such as fruit boar, etc) on “special spot area, I suggest you to “quarantine” them, so you’re not accidentally sacrifice your only one pet. I have put all of my duplicated pets on the area near the pond of souls, so I can train and view them easily.
You can also give your pets a certain name (duplicate, clone, trade, etc).
For the last stage (4th) you have 24 hours refresh time and 3 days to complete it. If you have followed my advice then I believe you have already kept many duplicated pets on “special” area. This is the time to use them to complete the quest, if you don’t have the required pet then try to breed it, since the time is really long (3-4 days) I believe you will be able to breed them anyway. The reward for the last stage is a well refined stone :), you will get more than one for less rare stone (such as bravery, I get 3 of them when I complete the 4th stage and only 1 shadow stone on the next cycle).