The Theurgist Level 25 Ice Pet have potentially the wrong Delve value for its dmg and snare nuke. On the same monster the level 18 pets nuke for more damage and have the same resist chance.
Level 18 pets occasionally nuking for 109 dmg on a monster but the level 25 pets only nuking for 68.
Please have a look at the ice pet subspell delve values and fix accordingly. According to the archived charplaner from 2022 the level 25 pet should be the first one with the 159 delve dmg and snare nuke, which should be significantly more than the 97 delve of the level 18 pet.