15
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In GURPS Magic (all editions have had the same rule, but I'm playing 4th at present), mages pay a reduced fatigue cost to cast spells at high skill -- skill 15 reduces by 1, and skill 20 by 2.

As far as anything I've been able to find, that means a pair of wizards can recharge each other's spent fatigue as follows: Wizard A casts Lend Energy (skill 15) and lends Wizard B one or more points to replace B's spent fatigue. Wizard B then uses the same spell (also at skill 15) to replace A's spent fatigue. At each repetition, the caster pays one point less to cast the spell than it restores to the subject, with the effect that two mages can fully recharge each other (with the last recharge lending only a single point at no fatigue cost) in much less than a minute (even if they know Recover Energy, recovering from near-total fatigue would usually take 15-20 minutes).

This could be easier and even faster if Lend Energy could be cast on oneself, but I'm pretty sure that flavor of cheeses is too stinky and has been officially disallowed...

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42
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The designers saw that exploit coming!

The exploit doesn't work in GURPS 3E nor 4E.

  • GURPS Magic for GURPS 3E says on the spell Lend Energy says, "The cost for this spell is not reduced by high skill" (44).
  • GURPS Magic for GURPS 4E on the spell Lend Energy says, "Casting cost is not reduced by high skill" (89).

It's easy to miss. (Especially if you want to!)

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  • \$\begingroup\$ Guilty as charged (on wanting to miss the restriction). My DF Elder Spawn wuxia mage in a play-by-post wound up getting badly depleted before we even got underground, and the pacing of the adventure is such there's no time to Recover Energy. \$\endgroup\$ – Zeiss Ikon Aug 30 '16 at 15:05
  • \$\begingroup\$ Reminds me of the old 3rd ed trick of mixing rapid fire with that one optional advantage or modifier that combined them all into one stream. \$\endgroup\$ – nijineko Aug 30 '16 at 18:44
18
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That is expressly forbidden in the rules. Under the cost of Lend Energy (in the 4th Edition of GURPS, p. 89 in GURPS Magic or p. 248 GURPS Basic Set: Characters), it states:

Casting cost is not reduced by high skill.

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17
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Read the full description of the ability.

Cost: Any amount; the energy spent by the caster goes to the subject as restored FP (e.g., if the caster spends 5 energy, the subject regains 5 lost FP). Casting cost is not reduced by high skill.

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-2
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Lend Energy is not reduced by skill, explicit in the description. Also, it's three points to charge one point for the recipient, so even if you could reduce the cost you're still paying a couple of dozen points (spell skill has to go to 25) that could be much better spent on Recover ST-20 and extra Fatigue--and this would mean you don't need to pay for an Ally to cross-cast with.

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  • \$\begingroup\$ I think you're conflating Lend Energy with another spell -- Steal Energy (necromancy) is the one that draws three points from the subject for each point restored to the caster. \$\endgroup\$ – Zeiss Ikon May 8 '17 at 11:15
  • \$\begingroup\$ Possibly. Commenting from work, don't have the books to hand. Still doesn't work, as noted in the other answers. However, the way to do it is have a bunch of non-mage assistants with Lend Energy wands, cheap, and get recharged in a second or so. Much faster. And this method is described for military mages in Yrth. a bunch of soldiers rock up, get given wants, give the mage one Fat, then go back to fighting. They're not drained of much, and the mage is now full. So the casters are at full mana at the beginning of every round for a whole fight. Scary. \$\endgroup\$ – Paul May May 8 '17 at 23:04
  • \$\begingroup\$ Those of us who missed the setting books for 2nd Ed. have probably never seen that method, but it wouldn't work now anyway -- must be a mage to use a wand. An item usable by non-mages has to have Power, and a dozen of those wands would cost more than a basket of small Powerstones. \$\endgroup\$ – Zeiss Ikon May 9 '17 at 11:09
  • \$\begingroup\$ @ZeissIkon As I recall in Yrth there are a lot of potential mages around. Many people with Magery 0. No bonuses to it, but can sense magic items and use spells and wands. A military unit may very well have several such. \$\endgroup\$ – Zan Lynx Feb 22 '18 at 0:07

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