In the hunt for the perfect GM reference material and GM Screen I created reference sheet for spell caster for Magic Situational Modifiers. This gathers all the modifiers for all the forms of Magic into one place. Some of the modifiers are optional – for example wearing armor iron in Glorantha, Monster Island options for orchestrated casting and sympathetic armor.
As always comments are welcome. The file is available here and of course also in the RQ6/Mythras charts page which collects all the charts I have made available (Combat flow, offensive and defensive special effects, healing and wounds, diminish effects, weapons, shields and passive blocking, close and ranged combat situational modifiers, movement and swimming effects, encumbrance calculator, sorcery tools and Gloranthan ships).
GM’s might also find the RQ/Mythras Encounter Generator useful