[ED4] Spell / Talent synergy. Frighten has some great ones

[ChrisDDickey]

It looks like Nethermancer spells stack with themselves better than any other classes. For example Elementalists have 3 different movement spells, but they don't stack. For example Earth surfing must be touching earth, but Mantle of the lightning Vanguard ends as soon as he touches earth again. So no stacking at all.

There are also some interesting possibilities for multiple casters of different disciplines buffing the same person. Somebody with Monstrous Mantal, and Aspect of the Fog Ghost, and Iron Hand is going to really bust heads.

But it looks like there are only a few areas where one class can double cast to get complimentary bonus.
Elementalists and Neathermancers might be able to stack three different Armor spells onto themselves. Wizards have two spells that aid avoid blow. Everybody but the illusionist can stack combat bonus (though I doubt many people would bother stacking an elementalists circle 8 spell with their circle 1 spell).
Elementalists get two excellent recovery test boosts in the first two circles. Many GMs would allow them to stack by saying that the recovery test taken upon awakening could be delayed until breakfast.
The biggest and most flexible synergy grouping is the 4 spells that enhance a nethermancers Frighten, plus Souless eyes and Aspect of the Menacing Tyrant also interact together for a whooping +9 bonus from just two spells.
None of the movement spells can enhance any of the others.
Nethermancers and Illusionists both have two stealth spells that ought to stack.

So once again, there are lots of spells that will give you a bit of a boost in one activity or another. But there are some spell combinations that will combine to give much bigger boosts.