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A placeholder is a token in angle brackets that is filled in when the line runs:
They work in any text a mechanic shows (messages, titles, action bars, names, commands, holograms) and in numbers: an option that takes a number also takes a placeholder, a range like 1to5, or a small sum (<caster.level>*2+5). Text is resolved per recipient, so <target.name> is each player’s own name when one message reaches several.

Who

Every entity placeholder starts with who it is about: <caster> alone, with nothing after the prefix, is its name.

What

Add any of these after the prefix: <target.hp>, <caster.l.x>.

Variables

An unset variable is empty, and numbers print without a trailing .0.

Skill values

Everything else

MythicMobs’ escape codes for characters YAML or the line syntax would otherwise eat work too: <&co> for :, <&sc> for ;, <&cm> for ,, <&eq> for =, <&lc> and <&rc> for { and }, <&lb> and <&rb> for [ and ], <&nm> for #, <&sp> for a space, <&nl> for a new line. Addons can add their own prefixes; see Extending the Effect Language.