Magus crown : you have to get all the regional blesings and next time you will get a bless you will speak with a god who ask you what do you want: or duplicate the effects on your blessings or get a rare item (the crown)
One of the things that has helped me the most has been the synergies. Tactician is amazing, it generates an absurd amount of speed, eliminating problems like the handcuff item (-40% speed) and being able to buy handcuffs for all monsters. These generate +2 attack in each fight and bulky synergy on top of that, which honestly in the late game is the most broken of all: Add attack and defense, distribute them and then add it to life... it's absurd.
The spyglasses is also an incredible object. It causes adjacent allies to get a huge amount of mana when casting and on top of that it grants tactician.
Mudgill is also seriously underrated. Look at the photo, how they all have more or less similar stats and Mudgill in the bottom right stats is doing solo MORE THAN HALF THE DAMAGE OF THE TEAM.
At first I had taken it because of what I told you. With the handcuffs and no speed with a lot of mana regeneration he could be casting the ability all the time without needing to hit, however I have evolved him into his 3rd form and I have equipped him with the object that repeats the cast of your ability. The result is that, a monster that does half the damage of the entire team XD