Erthenia

Zetsumei. The selected character dies. The target has +10 to magic resistance. 100

As I understand it, this spell is likely an equivalent to a spell that also works at a distance. To protect yourself, you need to have high magic resistance.

Beheading. The next attack on the character, if it hits, will be fatal. 5 Action Points. x2

Requires 5 Action Points, 2 Order Units, and being in melee range, as well as a successful attack. To protect yourself, you need high dodge (and maybe even parry and block).

I see a balance issue.