One new spell for each faction. Their duration is limited but you can cast them as often as you want and stack them on an army ... if you are able to provide all the resources that are needed.

Kingdom Spell Motivation : Cast for 30 mana and 5 Influence - Champion only - Unlocked with Ereog's Journal + Life II
Empire Spell Stimulation : Cast for 30 mana and 15 Gold - Champion only - Unlocked with Ereog's Journal + Death II

Both of them have the following effect :
- Army gets +1 to movement during 15 turns
- Mana maintenance per turn = 1

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Tested clean with FE 1.32.

The spells work perfectly but they're not perfect because of 2 things I couldn't manage (at least, alone ) :
- You won't see the seasons in the Heroes tooltip like you can see with the spells Tremor or Freeze
- You won't see the spell in your tech tree, under the Ereog's Journal tech

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Modifications from 0.99 to 1.0 :

- Tireless March is now back in your spellbook (why did I lock it ?)
- The effect is no more upgraded by life/death shards (I wanted that the shards you control increase the duration but I just couldn't get a CALC formula work for the duration. Frustration led me to use the CALC on the +x army moves but it was very "ugly")
- AI priority increased (currently in test)