Вот это я удивился, узнав, что лапочка Мерриль не может быть хиллером в Dragon age 2! Но!

Нашел, как это легко исправить. Вдруг кому понадобится.

With pyGFF, you can edit your pre-existing saves to enable the trees. As is the case when editing saves, ALWAYS BACK UP YOUR SAVE. With pyGFF, open your .das save file (C:\Users\(PC Username)\Documents\BioWare\Dragon Age 2\Characters\(Character Name)\Saves) and collapse "16003 SAVEGAME_PARTYLIST" then "16204 SAVEGAME_PARTYPOOLMEMBERS" then find the value "gen00fl_merrill" under the index ranging from 0 to 7 and collapse that one. Here, the top collapsible option should be "16209 SAVEGAME_CREATURE_STATS" and then CLICK ON "16309 SAVEGAME_ABILITYLIST". In the bottom-left of pyGFF's window should be a list (Index/Type/Value) with Add/Remove/Move Up/MoveDown buttons to the left. Scroll down a bit until you get to the value 305001, click it, then click the add button 2 to 4 times depending on if you want one or both trees added. Double click one of the created 0s you made, and change the value from 0 to 306000 (Creation Tree) and then click Save. If you added the the Creation tree, then next 0 needs to be a value of 306001. If you added a third 0, or you want just Spirit Healer, the next value needs to be 308000 followed by a 308001.

У меня все получилось.