I was wondering if someone has tried to implement the Ars Magica magic system into Rolemaster, and how.

I guess you could assign some cost to the forms and techniques, maybe scaling its values to a 100-based system (multiplying by 5 would be pretty accurate). I'm not sure if the magic realms would be obsolete or just affect some form and/or technique cost. For example, essence could be related with aquam, auram, ignem and terram, and mentalism obviously with mentem.

But what about formulaic spells? Use only a more powerful version of spontaneous magic?

I haven't thought deeply about it, I would love to read about it if someone has, if someone tried and failed or succeeded, and the exact mechanics involved.

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    \$\begingroup\$ As it stands, this question is almost certain to be closed as either "too broad" or "primarily opinion based". If you can edit it into something that fits this Q&A format better, however, it might be a good question . Hint: be specific. \$\endgroup\$ – Zeiss Ikon Mar 8 '17 at 12:41
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    \$\begingroup\$ Are you aware of the psyfire rules found in spacemaster companion 2 which are very close to Ars Magica spontaneous magic system? \$\endgroup\$ – Sardathrion - against SE abuse Mar 8 '17 at 12:43
  • \$\begingroup\$ @Sardathrion I'm not! I'll try to find a general explanation about it to see if it fits :) \$\endgroup\$ – JoePerkins Mar 8 '17 at 12:52
  • \$\begingroup\$ @JoePerkins Still pretty broad. I see at least three questions (scaling costs, applying spontaneous realms, and formulatic spells), and this format works better with single questions. Would also help to indicate what you've already done or tried to do, and how/if that worked for you. \$\endgroup\$ – Zeiss Ikon Mar 8 '17 at 13:09
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    \$\begingroup\$ I did something similar to this for Rolemaster based on the idea of a pre-arcane primal magic system, I'll dig up my notes. \$\endgroup\$ – Rob Mar 8 '17 at 13:49