Only Caligo and then Heolstor, and I intend to fight Caligo next as solo Guardian
I will make a wild guess and assume it's better to do the frosty Mountaintops SE event, tho I never really got to the top nor got the final reward, is there an optimal path to the top?
I will also assume Caligo's damage is half physic half magic, an anti magic greatshied could help against her