Once you reach Sa san stats, you will need to speak to Seyn in the center. Here are the steps you'll need to take to get the spells he offers.
1) Visit Seyn in center of Vortex and say 'Hello'
2) Say 'Hello' again, he will tell you to return when you
are humbled by the totems.
3) Go to Baekho shrine
4) Say 'Sa san'
5) Say 'Metal'
6) Collect 5 Metal, return, say 'Metal' again
7) Collect following items, then say 'Baekho'
- Baekho key
- Blood
- Gold acorn
- Whisper bracelet
- Tiger's favor
8) Say 'Baekho'
9) Items will be taken, you will receive 'Baekho essence'
10) Go to Ju jak, say 'Sa san'
11) Say 'Hot coal' with Hot coal (5) in inventory
12) Collect following items, then say 'Ju jak'
- Ju jak key
- Surge
- Gold acorn
- Holy ring
- Rooster's favor
13) Go to Hyun moo, say 'Sa san'
14) Say 'Moon wine' with 5 Moon wine in inventory
15) Collect following items then say 'Hyun moo'
- Hyun moo key
- Charm
- Gold acorn
- Sen glove
- Snake's favor
16) Go to Chung ryong, say 'Sa san'
17) Say 'Golden rabbit' after slaying golden rabbit
18) Collect following items then say 'Chung ryong'
- Chung ryong key
- Spike
- Gold acorn
- Titanium glove
- Dragon's favor
19) Return to Seyn and say 'Four guardians'
20) Your essences you collected will be taken, and your mind will expand as it learns a new spell.